Lycan
Preternatural
There is a difference between being msiguidedly into the occult and actively promoting a pagan religion over Christianity. You are correct that many 'Christians' have probably done the former, despite it being in opposition to their supposed faith, but the latter, which is what Hitler did, is enough to invalidate any claim to Christianity on the part of the adherent.
Where does he actively promote pagan religions over christianity? He spoke of the christian god quite frequently, in that his actions were in accordance to what the "almighty creator" wanted. I agree in that he may not have been a "good christian" as was stated earlier and we can argue the definition of a "true" christian, but in his mind he was "doing god's work" and so his religion (as warped a version as it was) was christianity. As far as the practice of pagan rituals or using pagan symbols, deciding religion, people that consider themselves "true" christians do it all the time, usually out of ignorance, but it is done all the same.