Comparing Satanists to Nazis is really weird. Hitler was a real person who committed genocide. Satan isn't real, and he never committed genocide, not even in the Bible.

Christians, on the other hand, have committed genocide, and so has the Christian God, according to the Bible, but that doesn't seem to have harmed Christianity at all. Additionally, the Nazis endorsed Christianity, not Satanism; but, again, that association doesn't seem to have harmed Christianity.