There is no logical reason why codes of morality should be so confusing, complicated, or difficult to understand that it takes a special class of people or any Holy Spirit to teach it to others. In fact, I understand it far better now that I have refused any spiritual monosodium glutamate from the Filthful and Disgraceful Slavebugger than I ever did while I was a witless (or, for that matter, a Catholic). And, as long as one sticks with the core of morality, it is no more difficult to understand than it is to learn your multiplication tables. (Which, for me, took about 10 seconds.)
It's when you start adding complex interpretations to things, use the Bible to attempt to predict specific events, and control others' lives that it becomes difficult to understand. Most of the "deeper things" put out by the Washtowel Babble and Crap Slaveholdery actually mean precisely nothing (and will soon be changed anyways). It is a complete waste of time to learn the different deals, classes, and type/antitypes that are all but identical. When you have 18 different classes that everyone belongs to all of them, why waste the time learning the tiny differences that are going to be changed the next time a washtowel touches on it?