You may say this is better for /pol/, but I figure the subject is deep enough for presence on /philosophy/.
Exactly as the subject line says. There's a small cottage industry of discussion as to his religious views....but I've never been satisfied with the results.
He clearly had a strong enough metaphysical fervor that he can't be described as a simple atheist. At the same time, whatever some may say about his upbringing in a Catholic household, he clearly wasn't a Christian. Take any quotation you can from him which mentions "God", and you can easily substitute it with "Fate", "Providence", "Destiny", etc. For those who contend he was a Catholic zealot, he had astonishingly little to say about Christ ameliorating Original Sin or Mary being the Queen of Heaven.
Shit, for those who present the argument of the "Gott Mit Uns" motto on SS belts, I have (will post pic if you want) a "Second Reich" coin from 1907 with that same motto inscribed on the side. So the phrase clearly predates the NSDAP period and had currency by inertia.
One can also come across sources which attest that Hitler frowned upon Himmler's attempt at neo-paganism. Thus, deism is the only conclusion we are left with by process of elimination, and it's quite a reasonable one.
When we think of "deist", we probably think of Thomas Jefferson, Ben Franklin, or other Enlightenment era figures. The M.O. of those thinkers was to observe the capacity of nature to carry out self-sustaining systems, as well as the capacity of people to carve out lives for themselves by innate talents of reasoning, so as to construe that a supreme creative force or governor intended for a universal order which could basically be described as classical liberalism.
Hitler similarly appealed to biology & history to demonstrate that there was an innate hierarchy of human races, with each one having a destiny as temporally erected by the time of its present circumstance.
The deist view is that there is a primary creative & intelligent input behind the Universe, but that it must be construed by studious observation rather than accepted in the event of a grand revelation. Given what I've outlined above, I don't see what better way to classify Hitler's stance towards religion & spirituality as anything other than deism.