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The Ilkhanate maintained traditional Mongol religious tolerance for a long time, practiced human sacrifice on at least one occasion (Hulegu's funeral), then tried to pull for Tibetan Buddhism for awhile before finally deciding to convert to Islam to bring the ruling Mongols closer to the population. These religious policies had a number of weird impacts, from the on-again-off-again Mongol-Christian alliance, to a war between the Muslim Golden Horde and the Ilkhanate (to some extent in order to protect the Horde's Muslim allies in Egypt).

In the end, the conversion came too little, too late and really only served to further destabilize the Caliphate. But what if Hulegu, much like Berke of the Golden Horde, had instead converted to Islam in the initial stages of his conquest of the Middle East.

This would mean that the Mongol ravaging of Mesopotamia may be somewhat less horrible than OTL. The semi-kinda-allies-sometimes situation with the Crusader states is unlikely to happen, instead the Mongols may ally with the Mamluks and stamp the Crusader states out entirely. The Mamluks could submit themselves to the new Mongol Caliphate, at which point they would be treated well.

Territorial concerns in Azerbaijan notwithstanding, a Hulegu-Berke war is less likely, so the Golden Horde may very well exert more pressure on Europe than in OTL. Perhaps a dual-pronged Mongol invasion of the Byzantine Empire, with Seljuk and Mamluk subject-allies as auxiliaries?
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