Isn't it all philosophy, though? Other ologies don't require belief at all. You don't have to believe in biology to become a biologist. Same with chemistry, although the earliest form of chemistry, alchemy, did. Another is astronomy and, again, it finds its roots in astrology, which was a study that also required belief, as did alchemy, in something irrational. You don't have to believe in myths to study mythology - it is usually a given that you do not - just as you don't need to believe the fantasies written by J. R. R. Tolkien in order to become expert in them. I appreciate that there will inevitably be atheist theologians, but are there any theologians who were atheist when they set out to become theologians? I would guess not, per your answer above. I studied and got my HBScF because I was in love with the forest. In order to find out as much as you can about God, it helps a great deal if you love Him first. Why else would you bother?
An observation, though. I don't know anyone who became a graduate forester who decided afterward that they don't love the forest.