alternatehistory.com

Your challenge, if you choose to accept it, is to find a way in which it is Islamic forces purging into Europe in the name of their faith rather than Christians purging into the Holy Land.

I was thinking that perhaps somewhere in Europe, there's a fervor of Muslim conversion, and they are punished harshly for apostasy and alsl punish the Arab-born leaders who led them to to abandon their faith. In an attempt to protect their fellow Muslims, they gather their armies and invade mainland Europe.
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