Theologians

It is said Socrates was a Philosopher—yet he studied theology—indeed was in spiritual contact. 
 Latin theologia, from Greek theologia "an account of the gods," from theologos "one discoursing on the gods," from theos "god" (from PIE root *dhes-, forming words for religious concepts) + -logos "treating of" (see -logy). 
E.g. St. Aquinas, Nietzsche.