Judge a tree by it's fruit. His remarks go counter to Christianity. He was as much a Christian as the lead character in Clockwork Orange turned to Christianity in prison.
Many claim to be Christians. It does not make it so.
Well, sure. Hitler's philosophy obviously goes counter to what is consensually considered to be the broad spirit of Christianity. Needless to say. Yet he accepts Jesus as Savior, and that's generally the demarcation of Christian versus non-Christian.
So you can say he was a twisted and perverse Christian who failed to grasp the full implications of the faith, and I'll agree with you readily. You can say he was a bad Christian, but he was a Christian nevertheless. Unless you want to play the same game as Muslims who wash their hands of Islamists by claiming they aren't Muslims.