I dont think the guy who made a rather beautiful painting of the Blessed Virgin Mary was a pagan, in Mein Kampf proper he frequently praises the Church at the time. Its likely he wasnt a big fan of the "Catholic" "Church{" in Germany, but theyve been outright heretics for a while and no real Catholic would take them seriously. If they were anywhere near as jewed during Weimar as they are now, Hitler would have been well within his authority as a secular leader to remove the heretics from the Church.