There is a linkage between Christianity and the Holocaust. Anti-semitism fostered by Christianity created the climate by which Jews could be scapegoated by the Nazis.
The most unendearing aspect of Christianity is its insistence that only through Christianity can one "be saved"; all others being damned to eternal torture. Such a belief system breeds a certain arrogance, and fosters contempt for people of other faiths. The Jews have taken the brunt of this contempt for two thousand years, and they can hardly be blamed for being suspicious of anything that fuels its fire, especially when the fire itself is lit from a tinderbox of fanaticism.