320 BC would be interesting
The thing is christianity must arrive in Japan before Islam did
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1. I don't see how this is remark is relevant.
2. IOTL Christianity might actually have arrived in Japan before Islam even existed; a number of researchers speculate that the first Nestorian Christians arrived in Japan as early as the 5th century, and there's even a historian who claims that the Khoryuji Temple in Kyoto (built in 603) was originally a Christian building that was later converted into a Buddhist temple.