alternatehistory.com

With your POD after AD 751, your challenge is that, by the year 1751 (so you get a nice even millennium to work with), China should be divided into two major states, one of which is explicitly Muslim, and one of which is explicitly Christian, though both are explicitly Chinese. They should comprise the majority of historical China between them, and should be roughly comparable in size and power. The later the POD, the better, and bonus points for not just having two rival Mongol Khanates form in China, divided by religion.
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