Amusingly, my university's Theology department has a reputation of deconverting people, many of whom are studying the subject in order to become priests. Apparently the subject is taught in a very scientific and critical manner. E.g. the exegesis lectures talk a lot about how it was common to make someone seem more impressive by claiming that he was born of a virgin, or about how many pre-Christian religions had a god who sacrificed his son and Christianity may just have borrowed the popular motif. This can apparently be disenchanting.