I think that "Sieg Heil" actually means Praise the Sun. The Nazi salute is actually a "Roman salute", where the arm is extended toward the sun. And people try to say that Hitler was a devout Catholic.
I think he used the RCC for his own purposes and used that religion as a tool, but that his true beliefs were not any form of Christianity but an ancient form of sun worship.
The RCC leadership and some priests have also often been corrupt or evil although I believe many individual Catholics are sincere Christians. I'm not a Catholic myself but I'm a non-denominational Christian so I have no reason to defend them as a denomination. I don't think it's fair to them to classify Hitler as being truly one of them though because his pagan beliefs differed so greatly from official RCC doctrines even if evil priests and an evil pope did take his side.
I think his true religious influences were people like Blavatsky and List and possibly Aleister Crowley who may or may not have met with Hitler at some point.
Statues of Apollo (a Greco-Roman sun god) sometimes show the same arm pose. Also Sieg is a rune that was also called "Sol" sometimes, which means sun.
Some say Sieg means victory and Sieg Heil means Hail the Victory. Even this plays into the sun worship aspect because "the unconquered sun" or "invincible sun" is called Sol Invictus, implying that the sun god is all powerful and unconquerable.
Hitler's attempt at creating an Axis alliance was one of the earlier modern attempts at a one-world system. He wanted the entire world to turn about the axis, not just Europe. He also put into practice the NWO doctrine of depopulation by murdering millions of people, both Jewish and others.
One thing that I was having a hard time wrapping my head around was how could Hitler be nationalistic? Nationalism is a right wing concept, while socialism is a left wing concept. You don't mix oil and water. So I got to thinking about it and concluded that Hitler only used nationalistic feelings and gave lip service to nationalism as a tool, much like he used the RCC's religion as a tool.
If he were truly nationalist, he would not have wanted the entire world to be one under his control. True nationalism calls for separation, borders, and distinct peoples. If there was a one-world system, even a Nazi one, there would be no individual nations anymore. Therefore, the nationalism that scholars use to try to portray the Nazis as right wing, was a farce. The left wing aspect, the socialism, was a true part of Nazi-ism.