Incorrect. He professed belief in "the spirit of Aryan man" not Christianity.
He persecuted the Christian churches the whole time he was in power, denigrated Christian teaching publicly, lived openly with a woman not his wife, and had Christian pastors like Bonhoeffer murdered and Christian pastors like Michael Faulhaber placed under house arrest.
He had every Jesuit priest in German imprisoned and most of them killed at Mauthausen.
He appointed as a Reichsminister of religion Alfred Rosenberg, who was an atheist dedicated to the replacemnt of Christianity with "Aryan humanism."
Rosenberg's 30 point plan for the German churches was to replace the Bible with Mein Kampf and the cross with the swastika.
If Hitler was a Christian, then so was Che Guevara.