The Islamic State is no mere collection of psychopaths. It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse. Here’s what that means for its strategy—and for how to stop it.

Graeme Wood  March 2015

What is the Islamic State?

Where did it come from, and what are its intentions? The simplicity of these questions can be deceiving, and few Western leaders seem to know the answers. In December, The New York Times published confidential comments by Major General Michael K. Nagata, the Special Operations commander for the United States in the Middle East, admitting that he had hardly begun figuring out the Islamic State’s appeal. “We have not defeated the idea,” he said. “We do not even understand the idea.” In the past year, President Obama has referred to the Islamic State, variously, as “not Islamic” and as al-Qaeda’s “jayvee team,” statements that reflected confusion about the group, and may have contributed to significant strategic errors.

The group seized Mosul, Iraq, last June, and already rules an area larger than the United Kingdom. Abu Bakr al-Baghdadi has been its leader since May 2010, but until last summer, his most recent known appearance on film was a grainy mug shot from a stay in U.S. captivity at Camp Bucca during the occupation of Iraq. Then, on July 5 of last year, he stepped into the pulpit of the Great Mosque of al-Nuri in Mosul, to deliver a Ramadan sermon as the first caliph in generations—upgrading his resolution from grainy to high-definition, and his position from hunted guerrilla to commander of all Muslims. The inflow of jihadists that followed, from around the world, was unprecedented in its pace and volume, and is continuing.

Our ignorance of the Islamic State is in some ways understandable: It is a hermit kingdom; few have gone there and returned. Baghdadi has spoken on camera only once. But his address, and the Islamic State’s countless other propaganda videos and encyclicals, are online, and the caliphate’s supporters have toiled mightily to make their project knowable. We can gather that their state rejects peace as a matter of principle; that it hungers for genocide; that its religious views make it constitutionally incapable of certain types of change, even if that change might ensure its survival; and that it considers itself a harbinger of—and headline player in—the imminent end of the world.

The Islamic State, also known as the Islamic State of Iraq and al-Sham (ISIS), follows a distinctive variety of Islam whose beliefs about the path to the Day of Judgment matter to its strategy, and can help the West know its enemy and predict its behavior. Its rise to power is less like the triumph of the Muslim Brotherhood in Egypt (a group whose leaders the Islamic State considers apostates) than like the realization of a dystopian alternate reality in which David Koresh or Jim Jones survived to wield absolute power over not just a few hundred people, but some 8 million.

We have misunderstood the nature of the Islamic State in at least two ways. First, we tend to see jihadism as monolithic, and to apply the logic of al‑Qaeda to an organization that has decisively eclipsed it. The Islamic State supporters I spoke with still refer to Osama bin Laden as “Sheikh Osama,” a title of honor. But jihadism has evolved since al-Qaeda’s heyday, from about 1998 to 2003, and many jihadists disdain the group’s priorities and current leadership.

Bin Laden viewed his terrorism as a prologue to a caliphate he did not expect to see in his lifetime. His organization was flexible, operating as a geographically diffuse network of autonomous cells. The Islamic State, by contrast, requires territory to remain legitimate, and a top-down structure to rule it. (Its bureaucracy is divided into civil and military arms, and its territory into provinces.)

We are misled in a second way, by a well-intentioned but dishonest campaign to deny the Islamic State’s medieval religious nature. […] In fact, much of what the group does looks nonsensical except in light of a sincere, carefully considered commitment to returning civilization to a seventh-century legal environment, and ultimately to bringing about the apocalypse.

The most-articulate spokesmen for that position are the Islamic State’s officials and supporters themselves. They refer derisively to “moderns.” In conversation, they insist that they will not—cannot—waver from governing precepts that were embedded in Islam by the Prophet Muhammad and his earliest followers. They often speak in codes and allusions that sound odd or old-fashioned to non-Muslims, but refer to specific traditions and texts of early Islam. […]

The reality is that the Islamic State is Islamic. Very Islamic. Yes, it has attracted psychopaths and adventure seekers, drawn largely from the disaffected populations of the Middle East and Europe. But the religion preached by its most ardent followers derives from coherent and even learned interpretations of Islam.

Virtually every major decision and law promulgated by the Islamic State adheres to […] the prophecy and example of Muhammad, in punctilious detail. Muslims can reject the Islamic State; nearly all do. But pretending that it isn’t actually a religious, millenarian group, with theology that must be understood to be combatted, has already led the United States to underestimate it and back foolish schemes to counter it. We’ll need to get acquainted with the Islamic State’s intellectual genealogy if we are to react in a way that will not strengthen it, but instead help it self-immolate in its own excessive zeal.

I. Devotion

In November, the Islamic State released an infomercial-like video tracing its origins to bin Laden. […] Notably unmentioned: bin Laden’s successor, Ayman al Zawahiri, the owlish Egyptian eye surgeon who currently heads al‑Qaeda. Zawahiri has not pledged allegiance to Baghdadi […] But the split between al-Qaeda and the Islamic State has been long in the making, and begins to explain, at least in part, the outsize bloodlust of the latter.

Zawahiri’s companion in isolation is a Jordanian cleric named Abu Muhammad al Maqdisi, 55, who has a fair claim to being al-Qaeda’s intellectual architect and the most important jihadist unknown to the average American newspaper reader. On most matters of doctrine, Maqdisi and the Islamic State agree. Both are closely identified with the jihadist wing of a branch of Sunnism called Salafism, after the Arabic al salaf al salih, the “pious forefathers.” These forefathers are the Prophet himself and his earliest adherents, whom Salafis honor and emulate as the models for all behavior, including warfare, couture, family life, even dentistry.

Maqdisi taught Zarqawi, who went to war in Iraq with the older man’s advice in mind. In time, though, Zarqawi surpassed his mentor in fanaticism, and eventually earned his rebuke. At issue was Zarqawi’s penchant for bloody spectacle—and, as a matter of doctrine, his hatred of other Muslims, to the point of excommunicating and killing them. […]

Denying the holiness of the Koran or the prophecies of Muhammad is straightforward apostasy. But Zarqawi and the state he spawned take the position that many other acts can remove a Muslim from Islam. These include, in certain cases, selling alcohol or drugs, wearing Western clothes or shaving one’s beard, voting in an election—even for a Muslim candidate—and being lax about calling other people apostates. Being a Shiite, as most Iraqi Arabs are, meets the standard as well, because the Islamic State regards Shiism as innovation, and to innovate on the Koran is to deny its initial perfection. […] That means roughly 200 million Shia are marked for death. So too are the heads of state of every Muslim country, who have elevated man-made law above Sharia by running for office or enforcing laws not made by God.

Following takfiri doctrine, the Islamic State is committed to purifying the world by killing vast numbers of people. The lack of objective reporting from its territory makes the true extent of the slaughter unknowable, but social-media posts from the region suggest that individual executions happen more or less continually, and mass executions every few weeks. Muslim “apostates” are the most common victims. Exempted from automatic execution, it appears, are Christians who do not resist their new government. Baghdadi permits them to live, as long as they pay a special tax, known as the jizya, and acknowledge their subjugation. The Koranic authority for this practice is not in dispute.

Centuries have passed since the wars of religion ceased in Europe, and since men stopped dying in large numbers because of arcane theological disputes. Hence, perhaps, the incredulity and denial with which Westerners have greeted news of the theology and practices of the Islamic State. Many refuse to believe that this group is as devout as it claims to be, or as backward-looking or apocalyptic as its actions and statements suggest.

[…] the exclusion of ideology reflects another kind of Western bias: that if religious ideology doesn’t matter much in Washington or Berlin, surely it must be equally irrelevant in Raqqa or Mosul. When a masked executioner says Allahu akbar while beheading an apostate, sometimes he’s doing so for religious reasons.

Many mainstream Muslim organizations have gone so far as to say the Islamic State is, in fact, un-Islamic. […] But Muslims who call the Islamic State un-Islamic are typically, as the Princeton scholar Bernard Haykel, the leading expert on the group’s theology, told me, “embarrassed and politically correct, with a cotton-candy view of their own religion” that neglects “what their religion has historically and legally required.” Many denials of the Islamic State’s religious nature, he said, are rooted in an “interfaith-Christian-nonsense tradition.”

Every academic I asked about the Islamic State’s ideology sent me to Haykel. Of partial Lebanese descent, Haykel grew up in Lebanon and the United States […] According to Haykel, the ranks of the Islamic State are deeply infused with religious vigor. Koranic quotations are ubiquitous. “Even the foot soldiers spout this stuff constantly,” Haykel said. […] He regards the claim that the Islamic State has distorted the texts of Islam as preposterous, sustainable only through willful ignorance. “People want to absolve Islam,” he said. “It’s this ‘Islam is a religion of peace’ mantra. As if there is such a thing as ‘Islam’! It’s what Muslims do, and how they interpret their texts.” Those texts are shared by all Sunni Muslims, not just the Islamic State. […]

In Haykel’s estimation, the fighters of the Islamic State are authentic throwbacks to early Islam and are faithfully reproducing its norms of war. This behavior includes a number of practices that modern Muslims tend to prefer not to acknowledge as integral to their sacred texts. “Slavery, crucifixion, and beheadings are not something that freakish [jihadists] are cherry-picking from the medieval tradition,” Haykel said. Islamic State fighters “are smack in the middle of the medieval tradition and are bringing it wholesale into the present day.”

The Koran specifies crucifixion as one of the only punishments permitted for enemies of Islam. The tax on Christians finds clear endorsement in the Surah Al-Tawba, the Koran’s ninth chapter, which instructs Muslims to fight Christians and Jews “until they pay the jizya with willing submission, and feel themselves subdued.” The Prophet, whom all Muslims consider exemplary, imposed these rules and owned slaves.

Leaders of the Islamic State have taken emulation of Muhammad as strict duty, and have revived traditions that have been dormant for hundreds of years. “What’s striking about them is not just the literalism, but also the seriousness with which they read these texts,” Haykel said. “There is an assiduous, obsessive seriousness that Muslims don’t normally have.” […]

“We will conquer your Rome, break your crosses, and enslave your women,” Adnani, the spokesman, promised in one of his periodic valentines to the West. “If we do not reach that time, then our children and grandchildren will reach it, and they will sell your sons as slaves at the slave market.”

II. Territory

Tens of thousands of foreign Muslims are thought to have immigrated to the Islamic State. Recruits hail from France, the United Kingdom, Belgium, Germany, Holland, Australia, Indonesia, the United States, and many other places. Many have come to fight, and many intend to die. […]

The caliphate […] is not just a political entity but also a vehicle for salvation. Islamic State propaganda regularly reports the pledges of baya’a (allegiance) rolling in from jihadist groups across the Muslim world. […]

To be the caliph, one must meet conditions outlined in Sunni law—being a Muslim adult man of Quraysh descent; exhibiting moral probity and physical and mental integrity; and having ’amr, or authority. This last criterion […] is the hardest to fulfill, and requires that the caliph have territory in which he can enforce Islamic law. Baghdadi’s Islamic State achieved that long before June 29 […] and as soon as it did, a Western convert within the group’s ranks …who was] “something of a leader”—began murmuring about the religious obligation to declare a caliphate […] further delay would be sinful. […]

After Baghdadi’s July sermon, a stream of jihadists began flowing daily into Syria with renewed motivation. Jürgen Todenhöfer, a German author and former politician who visited the Islamic State in December, reported the arrival of 100 fighters at one Turkish-border recruitment station in just two days. His report, among others, suggests a still-steady inflow of foreigners, ready to give up everything at home for a shot at paradise in the worst place on Earth. […]

The caliph is required to implement Sharia. Any deviation will compel those who have pledged allegiance to inform the caliph in private of his error and, in extreme cases, to excommunicate and replace him if he persists. […] In return, the caliph commands obedience—and those who persist in supporting non-Muslim governments, after being duly warned and educated about their sin, are considered apostates. […]

III. The Apocalypse

All Muslims acknowledge that God is the only one who knows the future. But they also agree that he has offered us a peek at it, in the Koran and in narrations of the Prophet. The Islamic State differs from nearly every other current jihadist movement in believing that it is written into God’s script as a central character. It is in this casting that the Islamic State is most boldly distinctive from its predecessors, and clearest in the religious nature of its mission.

In broad strokes, al-Qaeda acts like an underground political movement, with worldly goals in sight at all times—the expulsion of non-Muslims from the Arabian peninsula, the abolishment of the state of Israel, the end of support for dictatorships in Muslim lands. The Islamic State has its share of worldly concerns (including, in the places it controls, collecting garbage and keeping the water running), but the End of Days is a leitmotif of its propaganda. Bin Laden rarely mentioned the apocalypse, and when he did, he seemed to presume that he would be long dead when the glorious moment of divine comeuppance finally arrived. […]

During the last years of the U.S. occupation of Iraq, the Islamic State’s immediate founding fathers, by contrast, saw signs of the end times everywhere. They were anticipating, within a year, the arrival of the Mahdi—a messianic figure destined to lead the Muslims to victory before the end of the world.  […]

[Beliefs] based on mainstream Sunni sources […] appear all over the Islamic State’s propaganda. These include the belief that there will be only 12 legitimate caliphs, and Baghdadi is the eighth; that the armies of Rome will mass to meet the armies of Islam in northern Syria; and that Islam’s final showdown with an anti-Messiah will occur in Jerusalem after a period of renewed Islamic conquest.

The Islamic State has attached great importance to the Syrian city of Dabiq, near Aleppo. It named its propaganda magazine after the town, and celebrated madly when (at great cost) it conquered Dabiq’s strategically unimportant plains. It is here, the Prophet reportedly said, that the armies of Rome will set up their camp. The armies of Islam will meet them, and Dabiq will be Rome’s Waterloo or its Antietam. […]

Now that it has taken Dabiq, the Islamic State awaits the arrival of an enemy army there, whose defeat will initiate the countdown to the apocalypse. Western media frequently miss references to Dabiq in the Islamic State’s videos, and focus instead on lurid scenes of beheading. […] During fighting in Iraq in December, after mujahideen (perhaps inaccurately) reported having seen American soldiers in battle, Islamic State Twitter accounts erupted in spasms of pleasure […]

The Prophetic narration that foretells the Dabiq battle refers to the enemy as Rome. Who “Rome” is, now that the pope has no army, remains a matter of debate. But Cerantonio makes a case that Rome meant the Eastern Roman empire, which had its capital in what is now Istanbul. We should think of Rome as the Republic of Turkey—the same republic that ended the last self-identified caliphate, 90 years ago. Other Islamic State sources suggest that Rome might mean any infidel army, and the Americans will do nicely.

After its battle in Dabiq […] the caliphate will expand and sack Istanbul. Some believe it will then cover the entire Earth […] An anti-Messiah, known in Muslim apocalyptic literature as Dajjal, will come from the Khorasan region of eastern Iran and kill a vast number of the caliphate’s fighters, until just 5,000 remain, cornered in Jerusalem. Just as Dajjal prepares to finish them off, Jesus—the second-most-revered prophet in Islam—will return to Earth, spear Dajjal, and lead the Muslims to victory. […]

IV. The Fight

The ideological purity of the Islamic State has one compensating virtue: it allows us to predict some of the group’s actions. Osama bin Laden was seldom predictable. […] By contrast, the Islamic State boasts openly about its plans—not all of them, but enough so that by listening carefully, we can deduce how it intends to govern and expand.

[…] detailed descriptions of how the Islamic State must conduct its foreign policy, now that it is a caliphate. It has already taken up what Islamic law refers to as “offensive jihad,” the forcible expansion into countries that are ruled by non-Muslims […]  the waging of war to expand the caliphate is an essential duty of the caliph. […] the state has an obligation to terrorize its enemies—a holy order to scare the shit out of them with beheadings and crucifixions and enslavement of women and children, because doing so hastens victory and avoids prolonged conflict.

[…] Islamic law permits only temporary peace treaties, lasting no longer than a decade. Similarly, accepting any border is anathema, as stated by the Prophet and echoed in the Islamic State’s propaganda videos. If the caliph consents to a longer-term peace or permanent border, he will be in error. Temporary peace treaties are renewable, but may not be applied to all enemies at once: the caliph must wage jihad at least once a year. He may not rest, or he will fall into a state of sin. […]

The modern international system, born of the 1648 Peace of Westphalia, relies on each state’s willingness to recognize borders, however grudgingly. For the Islamic State, that recognition is ideological suicide. Other Islamist groups, such as the Muslim Brotherhood and Hamas, have succumbed to the blandishments of democracy and the potential for an invitation to the community of nations, complete with a UN seat. Negotiation and accommodation have worked, at times, for the Taliban as well. […] To the Islamic State these are not options, but acts of apostasy.

The United States and its allies have reacted to the Islamic State belatedly and in an apparent daze. The group’s ambitions and rough strategic blueprints were evident in its pronouncements and in social-media chatter as far back as 2011, when it was just one of many terrorist groups in Syria and Iraq and hadn’t yet committed mass atrocities. Adnani, the spokesman, told followers then that the group’s ambition was to “restore the Islamic caliphate,” and he evoked the apocalypse, saying, “There are but a few days left.” Baghdadi had already styled himself “commander of the faithful,” a title ordinarily reserved for caliphs, in 2011. […]

If we had identified the Islamic State’s intentions early, and realized that the vacuum in Syria and Iraq would give it ample space to carry them out, we might, at a minimum, have pushed Iraq to harden its border with Syria and preemptively make deals with its Sunnis. That would at least have avoided the electrifying propaganda effect created by the declaration of a caliphate just after the conquest of Iraq’s third-largest city. Yet, just over a year ago, Obama told The New Yorker that he considered ISIS to be al-Qaeda’s weaker partner. “If a jayvee team puts on Lakers uniforms that doesn’t make them Kobe Bryant,” the president said.

Our failure to appreciate the split between the Islamic State and al-Qaeda, and the essential differences between the two, has led to dangerous decisions. Last fall, to take one example, the U.S. government consented to a desperate plan to save Peter Kassig’s life. The plan facilitated—indeed, required—the interaction of some of the founding figures of the Islamic State and al-Qaeda, and could hardly have looked more hastily improvised.

It entailed the enlistment of Abu Muhammad al Maqdisi, the Zarqawi mentor and al-Qaeda grandee, to approach Turki al-Binali, the Islamic State’s chief ideologue and a former student of Maqdisi’s, even though the two men had fallen out due to Maqdisi’s criticism of the Islamic State.[…] the decision to play matchmaker for America’s two main terrorist antagonists reveals astonishingly poor judgment.

Chastened by our earlier indifference, we are now meeting the Islamic State via Kurdish and Iraqi proxy on the battlefield, and with regular air assaults. Those strategies haven’t dislodged the Islamic State from any of its major territorial possessions, although they’ve kept it from directly assaulting Baghdad and Erbil and slaughtering Shia and Kurds there.

Some observers have called for escalation, including several predictable voices from the interventionist right (Max Boot, Frederick Kagan), who have urged the deployment of tens of thousands of American soldiers. These calls should not be dismissed too quickly: an avowedly genocidal organization is on its potential victims’ front lawn, and it is committing daily atrocities in the territory it already controls.

One way to un-cast the Islamic State’s spell over its adherents would be to overpower it militarily and occupy the parts of Syria and Iraq now under caliphate rule. Al‑Qaeda is ineradicable because it can survive, cockroach-like, by going underground. The Islamic State cannot. If it loses its grip on its territory in Syria and Iraq, it will cease to be a caliphate. Caliphates cannot exist as underground movements, because territorial authority is a requirement: take away its command of territory, and all those oaths of allegiance are no longer binding. Former pledges could of course continue to attack the West and behead their enemies, as freelancers. But the propaganda value of the caliphate would disappear, and with it the supposed religious duty to immigrate and serve it. If the United States were to invade, the Islamic State’s obsession with battle at Dabiq suggests that it might send vast resources there, as if in a conventional battle. If the state musters at Dabiq in full force, only to be routed, it might never recover.

And yet the risks of escalation are enormous. The biggest proponent of an American invasion is the Islamic State itself. The provocative videos, in which a black-hooded executioner addresses President Obama by name, are clearly made to draw America into the fight. An invasion would be a huge propaganda victory for jihadists worldwide: irrespective of whether they have given baya’a to the caliph, they all believe that the United States wants to embark on a modern-day Crusade and kill Muslims. Yet another invasion and occupation would confirm that suspicion, and bolster recruitment. Add the incompetence of our previous efforts as occupiers, and we have reason for reluctance. The rise of ISIS, after all, happened only because our previous occupation created space for Zarqawi and his followers. Who knows the consequences of another botched job?

Given everything we know about the Islamic State, continuing to slowly bleed it, through air strikes and proxy warfare, appears the best of bad military options. Neither the Kurds nor the Shia will ever subdue and control the whole Sunni heartland of Syria and Iraq—they are hated there, and have no appetite for such an adventure anyway. But they can keep the Islamic State from fulfilling its duty to expand. And with every month that it fails to expand, it resembles less the conquering state of the Prophet Muhammad than yet another Middle Eastern government failing to bring prosperity to its people.

The humanitarian cost of the Islamic State’s existence is high. But its threat to the United States is smaller than its all too frequent conflation with al-Qaeda would suggest. Al-Qaeda’s core is rare among jihadist groups for its focus on the “far enemy” (the West); most jihadist groups’ main concerns lie closer to home. That’s especially true of the Islamic State, precisely because of its ideology. It sees enemies everywhere around it, and while its leadership wishes ill on the United States, the application of Sharia in the caliphate and the expansion to contiguous lands are paramount. Baghdadi has said as much directly: in November he told his Saudi agents to “deal with the rafida [Shia] first … then al-Sulul [Sunni supporters of the Saudi monarchy] … before the crusaders and their bases.” […]

A few “lone wolf” supporters of the Islamic State have attacked Western targets, and more attacks will come. But most of the attackers have been frustrated amateurs, unable to immigrate to the caliphate because of confiscated passports or other problems. Even if the Islamic State cheers these attacks—and it does in its propaganda—it hasn’t yet planned and financed one. (The Charlie Hebdo attack in Paris in January was principally an al‑Qaeda operation.) […]

Properly contained, the Islamic State is likely to be its own undoing. No country is its ally, and its ideology ensures that this will remain the case. The land it controls, while expansive, is mostly uninhabited and poor. As it stagnates or slowly shrinks, its claim that it is the engine of God’s will and the agent of apocalypse will weaken, and fewer believers will arrive. And as more reports of misery within it leak out, radical Islamist movements elsewhere will be discredited: No one has tried harder to implement strict Sharia by violence. This is what it looks like.

Even so, the death of the Islamic State is unlikely to be quick, and things could still go badly wrong: if the Islamic State obtained the allegiance of al‑Qaeda—increasing, in one swoop, the unity of its base—it could wax into a worse foe than we’ve yet seen. The rift between the Islamic State and al-Qaeda has, if anything, grown in the past few months; the December issue of Dabiq featured a long account of an al‑Qaeda defector who described his old group as corrupt and ineffectual, and Zawahiri as a distant and unfit leader. But we should watch carefully for a rapprochement.

Without a catastrophe such as this, however, or perhaps the threat of the Islamic State’s storming Erbil, a vast ground invasion would certainly make the situation worse.

V. Dissuasion

It would be facile, even exculpatory, to call the problem of the Islamic State “a problem with Islam.” The religion allows many interpretations, and Islamic State supporters are morally on the hook for the one they choose. And yet simply denouncing the Islamic State as un-Islamic can be counterproductive, especially if those who hear the message have read the holy texts and seen the endorsement of many of the caliphate’s practices written plainly within them. […]

That the Islamic State holds the imminent fulfillment of prophecy as a matter of dogma at least tells us the mettle of our opponent. It is ready to cheer its own near-obliteration, and to remain confident, even when surrounded, that it will receive divine succor if it stays true to the Prophetic model. Ideological tools may convince some potential converts that the group’s message is false, and military tools can limit its horrors. But for an organization as impervious to persuasion as the Islamic State, few measures short of these will matter, and the war may be a long one, even if it doesn’t last until the end of time.