alternatehistory.com

..And no, I don't mean Mormonism.

Anyway, I'd like some ideas for a fourth Abrahamic religion arising in the medieval era, after or between Christianity and Islam. This religion must be partially based on an interpretation of the Old Testament (like how Islam has Ishmael instead of Issac as the favored son).

Where could such a religion arise, what are some good interpretations that could be made into this new religion, and what would be the reaction across the Jewish, Muslim, and Christian communities? What sort of support could this new religion reasonably expect?
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