Doctor Faustus is, indeed, a very heavy handed theme in regards to religion. Dr. Faustus, the character, seeks out wisdom that is forbidden to know. He purposely pursues the knowledge that will gain him fame, fortune, and power over others (even nature). The theme, of course, is that no one can attempt to play God without the consequences. As a result, Dr. Faustus, going against the church suffers dire consequences and his fate is hellish.