I don’t think that is quite accurate - the majority of the German people identified as Christian, and while Himmler did want to replace the church he was forbidden by Hitler because Hitler did not want to risk alienating the Christian populace during the war.
Alternate ideas that were popular at the time were Nazism as a state religion (which is what they depicted in Man In The High Castle), and “Positive Christianity” which basically removed the Old Testament, gave Jesus an Aryan lineage, and might have included Hitler as a sort of saint or contemporary savior.
But that said - the occult stuff has made for some of my favorite movies and video games. If not for the Nazis, Indiana Jones would have ended up battling gangsters and mad scientists with army of zombie Africans and its not the same movie at all.
(If anyone knows the name of that 50s adventure series with the mad scientist that used a machine to turn Africans into his zombie army, I can’t remember to save my life.)
This was then - everyone was far more religious in the first part of the 20th century than today! You can't take current German sensibilities as representative of that time.