Hitler very much believed in God. That is easily demonstrated by good quotes from his own writings and sayings.

Hitler sometimes used his religious belief as the reason for his horrible actions, Hitler often said that divine providence had put him where he was in order to complete the task before him.

Atheists were, in fact, not permitted to join the SS as the Nazis associated atheism with communism and (ironically) Jews. SS members were required to be affiliated with a church, whether Catholic or Protestant, and this was noted on their ID cards.
Nazi belt buckles says “Gott Mit Uns” (God with us).

The Nazis frequently cast themselves as the “defenders of Christendom”.

Nazis were predominantly Catholics and Protestants, Hitler loathed atheists, and claimed atheists were all communists, hence where possible he even got them killed.

Hitler often admonish his men to practice Gottgläubig.
https://en.m.wikipedia.org/wiki/Gottgl%C3%A4ubig


Also, According to the memoirs of Nazi Minister of War Production Albert Speer, Hitler had high praise for Islam, wishing that it was the religion of the Germanic people. “The Mohammedan religion would have been much more compatible to us than Christianity. Why did it have to be Christianity with its meekness and flabbiness?” Hitler is quoted as saying.

Tens of thousands of Muslims fought for the Nazis in World War Two, Muslim SS divisions were created and Nazi movement was supported by muslim leaders like Grand Mufti of Palestine and Rashid ali al-Gaylani.
https://en.m.wikipedia.org/wiki/Relations_between_Nazi_Germany_and_the_Arab_world