Hitler was into the occult,he used Catholics to front his final solution. You can sit in a garage all day and call yourself a Maserati,doesn't make it true. Hitler knew how to manipulate. Unfortunately both Catholics and Protestants believed in the Replacement Theology at that time that teaches the Jews were Christ killers and therefore God was done with them. Since they were no longer chosen the Christian Church "replaced" the Jews. So many Christians did sit by and let the Jews be murdered. On the other hand many Christians gave their lives to save Jews, for instance Corrie Ten Boom,who survived,but lost her entire family.
Hitler's crimes clearly prove he was not the Christian he claimed to be. Ditto for Queen Victoria, King Leopold, and other Western imperialists who butchered millions of people in the Third World. You might recall that just a few years ago, there were certain Catholics who tried to confer sainthood upon imperialist Columbus despite the genocide he caused! Thus, churches did to them precisely as their counterparts did for Hitler.