alternatehistory.com

It's not terribly well known, but there were a lot of attempts by various Christian groups to convert Asia east of Iran during the first millennium (and some after that, even). These were somewhat successful (some of our board members are descended from pre-Portuguese Christian communities in India, for example), but obviously failed to convert the majority of the population. So what I'm asking here is what is the maximum plausible bounds of this evangelical effort? I mean, what are the largest geographical bounds (in terms of the most far-flung permanent Christian communities) and population bounds of such efforts to spread Christianity? What conditions would be more conducive to the spread of Christianity than OTL? (I imagine no Islam would be a biggy, or especially a Muhammed converts to Christianity scenario) Can we get, for example, Christianized Mongols? Or major Christian communities in China, SE Asia, or Japan?
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