1. Divination is real, and they are consulting whatever they called. Could be the victim. Could be someone/something else. Could be a deity. Long and short, unless you're practiced in this realm, you can't know. And there's no empirical proof.
2. It's a link to their subconscious. Nothing mysterious. But it's a way they can interrogate their own ideas about a situation without personally owning said ideas. Think of this akin to a couch and therapist.
3. Someone is playing with them and controlling a weak-willed person. In other words, they're choosing what's being divined in order to exert influence over someone else. This is not only a bad situation, it's likely illegal.
The tough part, is when divination is integral to someones' religion. What's to say that your reading verses with a bible is any less than me relying on the tarot? If you're allowed your religious expression, why not I? And speaking of such, isn't it common still to "swear to tell the truth, the only truth, so help you god"? My first question to that is, "Which God?"
1 would appear protected, 2 isn't, and 3 looks illegal. Hard call.