It looks more like Casual Frank is putting something in the man rather than taking something out of him.
Anyways, I don't think he really believes in the devil as such. He probably believes in evil forces that originate from the will to power and twist and corrupt man's inherent good will to the point where the only way to save humanity is to use our religious sense in turning to God, who will help re-establish human primacy through person-centered ethics.
Or something like that.