A devout Catholic would go to Church regularly and receive the Sacraments. A devount Catholic would not lie or wage wars of aggression. A devout Catholic would not try to exterminate whole races of human beings. A devout Catholic would certainly not commit suicide, as it is a MORTAL sin. A devout Catholic would not pass laws on sterilization and eugenics.
It is true part of the ARyan supremacy philosophy stemmed from some twisted versions of the New Testament, but to say Hitler got most of his philosophy from the new testament is a pretty huge stretch. He got most of his from rascist theories and philosophers of the era, and his personal life experiences.
Pope Pius XII described National Socialism as "the arrogant apostascy from Jesus Christ, the denial of His doctrine and His work of redemption, the cult of violence, the idolatry of race and blood, the overthrow of human liberty and dignity."