The suicide bomber who stepped inside the gold-domed shrine in southern Pakistan in February was wearing a vest
packed with ball bearings, bolts and screws. When he hit the detonator, he killed more than 80 people.

To the world, they were Muslims.
But to the Islamic State, which quickly claimed credit for the attack, they were something else: Mushrikin, an Arabic word
meaning polytheists.
Because the worshipers who died at the shrine of the Sufi philosopher Lal Shahbaz Qalandar had come bearing offerings of
rose petals and had prayed at the tomb of the revered saint, hard-liners saw their faith as an affront to Islam, which holds
that there is a single, indivisible God.
Since at least 2016, Islamic State militants have targeted Sufis, who practice a mystical form of Islam that includes the
veneration of saints, often at their tombs. The extremist group has systematically razed the tombs of Sufi saints and
dynamited their shrines. Just over a year ago, the Islamic State began carrying out mass executions of Sufi worshipers during
prayer.

While no group has claimed responsibility for the killings of more than 300 people on Friday in Egypt’s Sinai Peninsula, that
attack also took place inside a Sufi mosque. Egyptian officials on Saturday said the attackers were carrying the black flag of
the Islamic State, though the group has so far remained mum on whether its fighters were behind the savage violence.

After every attack of this nature, observers are perplexed at how a group claiming to be Islamic could kill members of its
own faith. But the voluminous writings published by Islamic State and Qaeda media branches, as well as the writings of hard-
liners from the Salafi sect and the Wahhabi school, make clear that these fundamentalists do not consider Sufis to be
Muslims at all.

Their particular animus toward the Sufi practice involves the tradition of visiting the graves of holy figures. The act of
praying to saints and worshiping at their tombs is an example of what extremists refer to as “shirk,” or polytheism, according
to Brill’s Encyclopedia of Islam.

“Shirk literally means association. It is the act of associating God with other entities,” said Jacob Olidort, a scholar of Islam,
a foreign policy adviser to Senator Orrin Hatch and the author of several reports for the Brookings Institution on these and
other concepts. “What they take the Sufis to task principally for is the intercession, the use of other media, to access God,
rather than going directly.”
Alexander Knysh, the author of two studies of Sufism and a professor of Islamic Studies at the University of Michigan in
Ann Arbor, agreed. “They believe Sufi shrines are the most egregious expression of that shirk,” he said. “You are turning to
a mediator, who is inserting himself between the believer and God, and in this way it becomes a kind of idol.”
Sufis venerate mystics, who in their lifetime were seen as close to the divine. They bring votive gifts to their graves, like rose
water or rose petals. Merchants heading on long voyages will come and make an offering, promising to make another if their
venture is successful, Mr. Knysh said.

Sufis, he said, are monotheistic and, to them, the practice does not supplant or create an equal to God. But hard-liners don’t
see it this way, and instead see Sufis as “grave worshipers.”
The debate over what constitutes idolatry in the Muslim faith is centuries old. In the early 1800s, fundamentalists in Saudi
Arabia went so far as to try to blow up the tomb of the Prophet Muhammad, Mr. Knysh said.
The notion of who is and isn’t Muslim has also occupied numerous Qaeda theologians, long before the rise of the Islamic
State. While the older terrorist group also holds Sufis to be heretics, Al Qaeda’s official branches have been more restrained
in its violence. When Qaeda fighters in northern Mali destroyed the tombs of Sufi saints in Timbuktu, the group’s emir in the
region sent them a multipage reprimand, warning that even though they were correct in principle, their actions could inflame
Muslim sentiment against them.

One of the ways the Islamic State has departed from Al Qaeda and its official affiliates has been its willingness to use
unbridled violence against Muslims they accuse of straying, including Shias and Sufis. In addition to the attack on the shrine
in Pakistan in February, the Islamic State bombed a Sufi place of worship in Baluchistan in 2016, and has carried out
targeted assassinations of Sufi clerics, including in Egypt.
The Islamic State’s own publication made clear as far back as 11 months ago that it considered Sufism to be one of the main
“diseases” it aimed to treat in Egypt. Rawda, the district where Friday’s attack occurred, was mentioned as an area where it
planned to “eradicate” Sufi beliefs.

In a question-and-answer with the Islamic State’s magazine Rumiyah, the emir of the group’s religious police in the area said:
“Our main focus, however, is to wage war against the manifestations of shirk and bid’ah, including Sufism,” using the word
bid’ah to describe heresy.

He goes on to say that “shirk has become very widespread” in the area, and outlines the main Sufi traditions in the region,
calling it a “disaster.”

“The Sufis believe that the dead have the power to bring about harm and benefit. Hence they direct various types of worship
toward the dead,” he said. “They also claim that the dead are intermediaries between them and Allah, just as human kings
have intermediaries between themselves and their subjects.”

The article includes images of a Sufi prayer hall in Sinai, and a photo of an old man kneeling as an Islamic State militant
lowers a blade over his neck. He is identified in the photograph as Abu Hiraz, a Sufi cleric, who according to news reports
was abducted in front of his home in late 2016.

In the article, the Islamic State acknowledged abducting the elderly man, who they say was sentenced to death because of
his embrace of polytheism.

They also issued a warning to other Sufis living in Egypt, saying they were “mushrikin” and that their “blood is filthy and
permissible to shed.”
To the World, They Are Muslims