They aren't confuscianist either, especially Japan.
And the model can't handle Confuscinism. In AGCEEP we managed to do a lot, but even with all the setup changes there are still things dunfimentally we cannot change. The steup in EU2 Vanilla is as bad as saying all of Europe should be Greeko-Roman because many of the influences of Christianity come from this religion.
Listen:
At its core, a western religious system can't handle Confuscanism as a religion in EU game.
At the same time making them all pagan is equally as bad.
Yes, Chinese and others (aside from Japan) were hardly Ch'n buddhist, but they were moreso than Confusciansit. The state was very much Confuscianst, but not its populace. I guess we could go with even more religions and make Taoism for China, Shintoism for Japan, others fror Korea, etc, but do you really want that?