“the Japanese with their Shinto Buddhism.”
Shintoism and Buddhism are two very different religions.
Buddhism is from India, but Shintoism is native to Japan.
Shintoism was the State religion, which declared the Emperor to be the divine descendant of the Shinto Sun Goddess Amaterasu (the reason for the sun on the flag). Shintoism also proposed that all ethnic Japanese were racially connected to this divinity, but that no other races/ethnicities could be.
There is nothing like any of that in Buddhism, which is explicitly universal to all.
Yes but while being far from an expert, my general understanding is that in Japan, the two are rather interwoven.
Never-the-less, the Japanese of WWII were as pagan and racist as the nazis, facts that the Left will never admit.