they really aren't related at all. As I understand it in Scientology, "Thetans" are an alien influence, or something like that.
"Theta" on the other hand, has to do with the third (or fourth) brainwave state, often at the level of consciousness known for REM sleep.
And, having finally connected this in my own head, I did a search on "theta healing" along with "brainwaves" and discovered that's exactly what it's about. Here's a bio on the founder of this type of healing:
The Power of Theta Brainwave to Heal
It's still a form of energy-healing, perhaps guided by some faith, but also mixed with the use of the theta brainwave state. Binaural beats allow people to get into these states without falling asleep, so it's at least backed by that kind of scientific research 
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