Many Germans were still Christians? How about the vast majority were Christian before during and after WWII?
Obviously I can make no progress in casting the scales off your eyes if you see “a fox will always be a fox” and think it embraces Darwin's theory and read “my Savior's blood upon the cross” and think it makes reference to a pantheistic God.
“I believe that I am acting in accordance with the will of the Almighty Creator: by defending myself against the Jew, I am fighting for the work of the Lord..” Hitler
Christianity was part of the Nazi party platform.
“My feelings as a Christian points me to my Lord and Savior as a fighter.” Hitler
So if you want to make the argument that Hitler was secretly anti-Christian go ahead - hard to influence a movement with secret “table talk”.
His speeches to the Nazi's; providing them their justification to go out and kill - were couched in terms that any anti-semite Christian in history would immediately recognize - heck - he sounded a lot like Martin Luther!
Think of "mainstream history" as often being equivalent to the news presented by our MSM ... not so good and definitely biased.
Cheers!