Hitler even said that he wished Germany was Islamic, since Islam was a better religion for soldiers than “weak” Christianity.
If Hitler knew he could have gotten away with putting Christians in the ovens along with the Jews, he would have done it.
Hitler was a powerholic. As suggested, the church, to which he had earlier declared affiliation, was a huge disappointment to his obsession. The thing to retort to Whoopi would be “yeah, about as Christian as you.”