I'd like to see this sourced, and know the exact value of the persecution. We have seen what happened when Hitler tried to persecute people, and it's not pretty. So far as I know, there was no great elimination of the Christian population of central Europe.
Look up Kirchenkampf, Weiss Rose, Clemens Cardinal von Galen, Karl Leisner, St. Maximillian Kolbe, Cardinal Bernhard Lichtenberg; I can name more if you want.
Once the war was over it was Hitler's intention to "root out and destroy the influence of the Christian Churches." (Source: Alan Bullock,
Hitler: A Study in Tyranny, 1991. New York: Harper Collins, p. 219.)
In
The Gentile Holocaust (2008) by Thomas Craughwell, he estimates over 20% of all Polish clergy was killed at Dachau concentration camp.
What of the Old Testament? I admit I'm moving goalposts here, but you said so yourself the only metric that matters is a belief in Jesus as the Son of God.
You can be a Christian and disbelieve in the Hebrew Bible, albeit it would be erroneous to do so.
Fair point, and yet there were many Christians - Protestants and Catholics - who were on board with him to the bitter end.
I've talked about how describing those people as Christians is fallacious on the history board
here.
From a perspective speaking in the '30s and '40s, you had no reason to believe Hitler wasn't Christian. At least no more than you had to believe that, say, Winston Churchill wasn't Christian.
Good reason why perhaps some Christians voted for him. But now we know for a fact that he wasn't.
No, you must demonstrate conclusively that he did not believe in Jesus Christ as the Son of God. You cannot simply handwave it away by pointing out that he was a horrible man. Indeed, he was. But there are many, many horrible men who profess belief in Christ, and some of them are even clergymen.
On whether Hitler was a Christian: "Emphatically not, if we consider Christianity in its traditional or orthodox form: Jesus as the son of God, dying for the redemption of the sins of all humankind. It is a nonsense to state that Hitler (or any of the Nazis) adhered to Christianity of this form." (Source: Samuel Koehne,
Hitler's faith: The debate over Nazism and religion, ABC Religion and Ethics, 18 Apr. 2012.)
Now it's time for you to cite some sources. Not from anti-Christian polemic authors, and not from anybody that solely quotes
Mein Kempf to demonstrate Hitler's beliefs.