Well, devout is definitely a strong word and overused, and more than likely not appropriate in this case. He definitely believed that he was doing the right thing in the eyes of God though and he didn't just invent these ideas on the spot to satisfy a personal hatred of Jews.
"Jewish hatred did not spring from Hitler, it came from the preaching of Catholic priests and Protestant ministers throughout Germany for hundreds of years."
So there was a deep rooted culture of Jewish hatred and it was incited and kept alive by the church itself. There are a few different 'flavours' of Christianity and you wouldn't accuse them of all being wrong, much less their congregation who simply follow the teachings of the clergy.