Islam is the original Nazism.
There was also pagan and, unfortunately Christian, anti-Semitism, which preceded Islam. Hitler himself defined fascism as “spontaneous return to the traditions of Rome.” In his own mind, he was interested in returning back to the Greco-Roman world that had not yet been infected with the Judeo-Christian virus, yet using the latest Social Darwinian Aryan science to get them there. He, of course, also had a strong outreach to the Muslims when he was alive because of their own strong anti-Semitic legacy. Islam’s anti-Semitism also came out of pagan anti-Semitism.
As far as Christian anti-Semitism goes, as bad as it was, this should perhaps not be surprising since many pagans became Christians. Their anti-Semitism was therefore a carryover from their pagan past, which often never got straightened out, even though the Bible itself strongly teaches against it.