When you get to the point where the National Reich Church is banning the Bible and Christian theology you’ve gotten to the point where the people aren’t believers anymore. The term church may still exist but it has a different meaning. That’s what happened in Germany, which by the time Hitler got into power was largely post-Christian in the first place. That doesn’t mean there were no Christians in Germany but let’s not pretend like the majority of Germans were Christians much less the majority or even sizable minority of National Socialists.
But the majority of Germans under Hitler were Christian. That is factual.