Well, I have a very different opinion about racism and religion, and I'll try to explain why.
From the history, I know two major incidents of racism: first is against Africans in Americas, and second is against Jews in Europe. And I believe that they are both have deep roots in religion.
I wrote earlier, what was the reasons for racism against Africans and for no racism against Asians.
But the most deadly and devastating racism incidents were against Jews, that first broke during crusades, and then in Nazi Germany. And from my opinion roots of such animal hatred lie in... Judaism. This is a very closed religion, and unlike open Christianity, that tries to convert almost anyone to the religion. Judaism is the religion for chosen by God peoples, and, of course, they treat other peoples like... well, not chosen. This is a source of great arrogance, of theories of Zion conspiracies and eventually antisemitism. And when uneducated cutthroats came to power, like during times of crusades or Third Reich, this hatred come outside and peoples die.
The situation is Asia is much more different. For example, when Alexander captured Persian empire, there wasn't racism towards them. They had different religions, different life styles, but in their religion and mythology there was nothing against each other. Even remember Genghis Khan, who captured almost half of the world. Who destroyed whole tribes. But he killed them not because they were different, but because they refused to subdue to him. Even more, for mongols, killing priests and pillaging temples, was taboo. They respected other religions and there were no racism.
I think that just being different and unknown is not enought to spark a devastating hatred. Some Americans, and even Europeans (well, unfortunately it becomes trans-global) with very liberal ideals believe that everything around should happen like in their country, and when they visit other countries, they are too loud, they ignore traditions, maybe because they don't know them, maybe because they don't want to follow them, they show themselves and not intentionally show disrespect to their hosts. This doesn't lead to racism, more like xenophobia, and people try to stand aside from these guests. But I think this is not enought to grow into full scale racism, there should be something else.
I could play a nazi card without religion, but my character has some more deep personal reasons for this, that I don't want to uncover yet. Maybe I'll do some form of RP arc or quest rotating about this subject, but at the moment my head is overloaded with other stuff.