Hitler not only was brought up a Roman Catholic Christian, but he expressed his Christian views into adulthood, including his period as Chancellor of the German Third Reich.
Although some might counter that Hitler's admission to Christianity, by itself, does not make one a Christian, how else can an individual convey to another his religion except from their own confession? One of the tenants of Christian belief, indeed the definition of a Christian, comes from the Pauline epistiles in regards to faith in Jesus:
Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified. -Galatians 2:16
To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus. Where is boasting then? It is excluded. By what law? of works? Nay: but by the law of faith. Therefore we conclude that a man is justified by faith without the deeds of the law. -Romans 3:26-28
Mein Kampf
Volume 1, Chapter 1, In the House of My Parents
"I had excellent opportunity to intoxicate myself with the solemn splendor of the brilliant church festivals. As was only natural, the abbot seemed to me, as the village priest had once seemed to my father, the highest and most desirable ideal."
-Adolf Hitler (Mein Kampf)
I don't think he meant "moral ideal." What Hitler was referring to was the clergy's ceremonial leadership position that impressed him so much as a child. Later, as dictator, he constantly attempted to produce spectacles and events that would emulate and replace religious ceremonies in the life of the German people. And of course, the person at the center of these new rites would be - who else but Adolf himself?