I'm a bit late, but Hitler was a believer and certainly used his catholic roots as one(amongst manner) reason to target the jews. An occult like paganesque element crept in through some 'cult of personality' fantasy....but he was never anywhere close to being an atheist or agnostic.

“My feeling as a Christian points me to my Lord and Saviour as a fighter. It points me to the man who once in loneliness, surrounded by only a few followers, recognized these jews for what they were and summoned men to the fight against then and who, God’s Truth! Was greatest not as sufferer but as fighter. In boundless love as a Christian and as a man I read through the passage which tells us how the Lord at last rose in His might and seized the scourge to drive out of the Temple the brood of vipers and of adders. How terrific was His fight for the world against the Jewish poison. Today, after two thousand years, with deepest emotion I recognize more profoundly than ever before – the fact that it was for this that He had to shed His blood upon the Cross. As a Christian I have no duty to allow myself to be cheated, but I have the duty to be a fighter for truth and justice. And as a man I have the duty to see to it that human society does not suffer the same catastrophic collapse as did the civilization of the ancient world some two thousand years ago - a civilization which was driven to its ruin through this same Jewish people.”
Adolf Hitler, speech of 12 April 1922, Munich (Norman H. Baynes, ed. The Speeches of Adolf Hitler, April 1922-August 1939, Vol. 1 of 2, pp. 19-20, Oxford University Press, 1942