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1: Hitler's personal beliefs didn't change the highly religious nature of his rhetoric and government.
I can accapt that bit about the rhetoric- although a religious pitch was hardly at the center of Hitler's spiel, in his speeches. He simply used it as an obligatory touchpoint. I've heard lots of politicians who do that, and it often rubs me the wrong way. Occasionally it sounds sincere. Very occasionally. (Not that sincerity should be confused with actual relevant merits, on a political issue.)
But the government part, no. It was an ad hoc bureaucracy of thugs, nothing more.
2: Hitler's Nazi government also targetted Christians who belonged to the wrong sects.
We are talking about very opportunistic people, here. They picked their scapegoat populations very shrewdly.
3: Even if one takes the concept that Hitler's statements were just so much propaganda, secularism is the belief in the seperation of Church and State (Which is why states that are atheist aren't always secular.) The Nazis tried to unite both under Nazi control.
The Nazis were involved in a cynical plan to turn out German Christianity and whore it to their own purposes. Too bad they largely succeeded.