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Considering how far Manichaeism reached IOTL, with adherents living in places as far apart as Roman Gaul and China, I was wondering how Manichaeism could possibly reach Japan and how it would then develop on the islands. A few specific questions:
If Manichaeism reaches Japan, how influential could it become? Would it be able to take the place of Buddhism in Japan?
How much could the religion syncretize with Shinto (like how Buddhism did IOTL)?
Would Japan's interactions with the rest of East Asia be significantly impacted by adopting Manichaeism?
Assuming there's a butterfly net over the rest of the world, how would a Manichean Japan interact with European Christians as opposed to IOTL?