If you want to make the argument that in secret and in private Hitler was anti-Christian you can go ahead.
But it is hard to motivate a movement to go out and kill millions of people based upon things you said in secret privately.
His public pronouncements that riled up his followers into thinking the Holocaust was a worthy goal of their State were all “Avenge my savior's blood upon the cross” and “cast the money changers out of the temple” language common throughout history to anti-semites who were Christian. Hitler sounded a lot like Martin Luther on the subject.
There is no such thing as a holy grail in Christianity. This kind of foolishness comes from paganism, not from the Bible. Faith in Christ is what provides eternal life, not the holy grail (Acts 16:31; Romans 4:1-8). It is the historic crucifixion and resurrection that provides salvation, not some kind of false security in contact with holy objects (Galatians 6:14-18; Colossians 2:13-17). Furthermore, anti-Semitism is a pagan invention. It was the anti-Semitic Haaman in the book of Esther who began the hatred of the Jews where we even first see the term “Jew.”
As far as Christianity is concerned, Read Romans 9:1-5 and John 4:22 to see the biblical Christian view of the Jews. Unfortunately, many Christians over the centuries have adopted the pagan anti-Semitism diatribe, but this was a carryover from paganism not from Christianity. Many pagans got saved, but held onto their anti-Semitism, completely overlooking the fact that the very disciples who founded Christianity were all Jews!