It depends which form of Christianity you are thinking of. The Roman Catholic Church was in complete co-operation with the Nazi's and to this day refuse to open up their records from the time of WW2. In Croatia the Roman Catholic clergy blessed the Croatian Ustashe (Nazi) soldiers as they slaughtered over a million innocent Serbs and Jews in Yugoslavia. The Catholic nuns also took part in the poisoning of young Serb and Jew children and babies. On the other hand the Orthodox Christian Church was staunchly against the Nazi's and fascism in general and was the only religious group to take and hide as well as protect Jews from persecution.
