Not secular. In the decades leading up to the formation of the Nazi Party, its ideologues began creating a fascist occult state religion centered around the idea that Germans "of pure blood" once had mystical powers and that their "blood" had become corrupted, and they lost their mystical powers, by having children with "mongrel races". This insanity was amplified when the Nazi Party was formed, and then amplified again when the Nazi Party took over Germany. It doesn't get a lot of coverage in some circles, but among other things, Himmler, head of the SS, actively promoted pagan and mystical elements, seeing the SS as an elite knightly order based on Teutonic and Aryan mythology. He chose Wewelsburg Castle as the spiritual headquarters of the SS, packing it with esoteric symbols, sun wheels, and neo-pagan mystical ceremonies, and rebuilt one of its larger circular rooms in one of its towers as an occult ritual chamber, the “Obergruppenführersaal” (Hall of the SS Generals) as a sacred space for high-ranking SS officers. He wanted to turn Wewelsburg into a Nazi Vatican.
Secularism was one of the Nazi Party's many enemies.