It's not magic words. Anybody can say they believe in Christianity or any other system and be lying.
I get that you want to say Hitler as a Christian because you dislike religion. I'm not really interested in going back-and-forth on that because frankly, it's silly.
Honestly it's no different than people trying to paint the Arizona shooter as a Tea Party member. The old "damn them by forced association " tactic is a pretty weak argument no matter how it's used or who's using it.
If it makes you feel better, go with it. Doesn't really work for me.
I don't give a poo if Hilter was a Christian or not. Someone else brought it up I just said he was a professing Christian.
I don't blame Christianity one bit for what Hilter did. He was a fuged up human and it had nothing to do with his religion.
Don't start putting words in my mouth because you can't prove your point.