hey, all. i have a new idea for a TL (the working-title is "Islamistan") in which Islam becomes the majority religion of the world (rather than Christianity) and a band of Muslim-majority nations stretch clear across the planet from southern Europe and North & West Africa through to Central and Southern Asia, and across the Pacific to the Americas
thing is, in order for this TL to become coherent and figure out where it should begin, there needs to be a legit POD. i don't know exceptionally much about the history of the Middle East, but i imagine the POD here would be sometime in the Middle Ages (perhaps during or shortly after the Crusades); at the latest, it must predate the Reconquista.
does anyone have any ideas?