manichaeism wank

My understanding is that Manichaeism lasted as a significant force much longer in China than it did in western Eurasia. https://en.m.wikipedia.org/wiki/Chinese_Manichaeism So... with a point of divergence after the seventh century (so, after Christianity and Islam have become significant...

With a POD after the foundation of Manichaeism by Mani, come up with a scenario where Manichaeism is the world's largest religion with over a quarter of the world's population following it while Christianity is an extinct religion which is more or less a footnote in the history books even with...