Hitler’s main problem with Catholicism is he didn’t believe or accept anything it taught. Other than that little issue, i guess he was fine with it.
When giving speeches to his Nazi and German supporters he mentioned God and Jesus and Christianity repeatedly.
Read his speeches. Read his writings. If you can stomach them. They are about on par with the Unibomber Manifesto or Earth in the Balance in my mind - the ravings of a fanatic.
What he believed in his heart of hearts is open to debate.
What he said in his speeches and wrote in his book are not.