But doesn't later going back or against your claim to be christian negate the original claim? You can't claim Hitler was christian just because he lied and told everybody he was.
He didn't lie. He was undoubtedly a Christian, as were most of his supporters. They considered themselves not only to be Christians, but Christians of the best kind - the sort that do God's work by eliminating the Jews who they held responsible for the death of Jesus.
Obviously they were cruel, immoral bastards, who bullied their way into power and then were ruthless in their use of homicide, and later genocide, to enforce their opinions on the people; But that most certainly doesn't disqualify them from being Christian - indeed, for a large part of the existence of the Christian faith, it was practically mandatory.
That they don't fit into a narrow and parochial view of Christianity that has only been around for a few decades, and even then only in the more civilized parts of the world, is no reason to declare them non-Christian. The only reason to do that appears to be an attempt to re-write history so that the Christians come out looking like the good guys, who value peace, love and brotherhood over dogma, power and obedience. But there is no factual support for this retcon. Quite the reverse - in Western Europe, this 'watered down', happy-clappy, flowers and bunny rabbits style of Christianity has proven to be so unpopular that most people simply abandoned religion altogether, rather than bother to subscribe to it.
Christianity appears to be incapable of surviving being run by people who are not attempting to seize or hold power.