Done it. Japanese people would probably be the greatest Christians of all time becauze so many of their core values line up with Christianity..but here is the issue

When the first missionaries went to Japan, they could not figure out how to properly translate the concept of sin because the word sin kind of translates to crime. So to a Japanese person, the idea that simply by existing they are by default criminals, in spite of living as a good person, does not sit right with them. The idea of "original sin" simply is not compatible with the Japanese way of thinking and living. That was the biggest failure in spreading the gospel to Japan

The indigenous Mexicans got a break because La Virgen De Guadalupe proved to them Christ was real but there were no apparitions or signs that occurred for the Japanese.

WW2 complicates it more. Wouldn't you wonder..why is this supposed Christian nation ok with killing 100k people in a one go? From the Japanese perspective at leaat.

I have faith there will be an awakening and Japan will proclaim the name of Jesus louder than any nation ever has. I can't count the number of times I am playing a Japanese game or watching an anime and something makes me think Praise Jesus. The core emotions, values, etc are already ALL there. They just need to let Him in.