Hitler speaks of his Catholicism in Mein Kampf. He never abandoned it.
Mein Kampf was written in 1924. “He became hostile to the church in adulthood” does ‘not’ = “abandoned.” Hitler, and several other key Nazis, had been raised Catholic, but became hostile to the church ‘at some point’ in adulthood. Regardless, he was a harsh and brutal murderer just as the atheists Stalin and Mao were, and just as the Crusaders were, and just as today’s Muslim terrorists are.