RR, brennakimi doesn't seem to be arguing that he is or isn't a Christian. The point here is that Hitler and the Nazis used Christianity, the ToE, paganism, whatever to further his agenda - the "Final Solution".
That he dabbled in the occult, or perverted evolutionary science, does not make him a pagan or an evolutionist. Indeed, the basis of much of modern paganism is peaceful (the Wiccan Rede for example).
Hitler was a madman, pure and simple. Maybe he thought he was a Christian, maybe he thought he was a pagan; it's a moot point now, because all we can say at this stage is that he used any means necessary, any leverage he could find, to justify the extermination of the Jews in Germany.