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While followers of these faiths can still marry, they have significant mutual opinion penalties, can declare holy wars against each other, and will be valid targets against which you'll need to seek the aid of Holy Orders like the Knights Templar and the Assassins. This includes how Catholics see Christian heresies like Catharism, the relationship between different pagan traditions, and the conflict between Sunni and Shia Islam.
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Hostile: Faiths that are in your religious group, but are seen by you as heretical or dangerous.This is the relationship between Catholic and Eastern Orthodox Christianity-there will be some friction between them, but not loads. Astray: Faiths that are similar to yours, but not exactly considered to be heretical.
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For example, there are multiple schools of Sunni Islam, but as long as everyone in the room is Sunni, they should get along fine. How different religious groups view each otherĮvery faith in Crusader Kings 3 views every other faith in the world one of four ways:
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