Although Japanese rulers haven't always been very peaceful, their culture is known for being caring and respectful towards others:
https://en.m.wikipedia.org/wiki/Racism_in_Japan
Many people try to make Japan sound perfect, but they have a lot of problems: https://archive.ph/0IoIQ
Japan lacks any law which prohibits racial, ethnic, or religious discrimination.
wikipedia.org/wiki/Murder_of_Junko_Furuta
https://en.m.wikipedia.org/wiki/Karoshi
Of course still not as bad as the US, but I don't it is because of religion, it is more because of the two party system. Look at Singapore 18% Christians and they don't have that many problems.
In the end I believe most problems in all countries are because of human nature, not religion. Religion is just one of the excuses they use for the horrible things they commit.