You could even theoretically have a Chinese emperor convert to a form of Christianity. IOTL there were Christians in China in 635, and Emperor Taizhong was very interested in the religion. Just have him convert to Christianity and yet still be tolerant, and allow missionaries to propagate the faith extensively, and eventually Christianity will kind of trickle down.
However, China would not be a Christian nation. At absolute best it would be a significant minority, with Christian emperors coming and going, but unless there is a whole Christian Dynasty, there is no real motivation to convert the entire nation.
EDIT: Could you have a Christian Mohammad at this time period and then have him go east instead of west?
However, China would not be a Christian nation. At absolute best it would be a significant minority, with Christian emperors coming and going, but unless there is a whole Christian Dynasty, there is no real motivation to convert the entire nation.
EDIT: Could you have a Christian Mohammad at this time period and then have him go east instead of west?
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