Satanism?

Tonight I watched the final episode of Speaking in Tongues with John Safran and Father Bob Maguire. It's a shame it's finished, it was a very good theological series. If you don't know it, there's John Safran and Father Bob sitting at a table discussing theological matters. It's far from dry and boring however, because Safran with his cheeky manner constantly prods and provokes cranky Father Bob, a Catholic priest. They have guests as well, and last week they had Jim Goad, but I'll be damned if I didn't miss most of that interview, which was on right at the beginning, and I tuned in late. Blazes!
Anyway, tonight they had a *Satanist* on there. He was only on for a little while so it was impossible to understand what he was about. What is that Satanist stuff all about, anyway? From what he said, that his mother was a Catholic, it seemed that maybe he was only reacting against Catholicism, rebelling against being forcibly taken to stupid Sunday school when he was a little fella. What does he do besides wear black clothes, put more pink dye in his hair, get another tattoo or piercing, and continue trying to perfect a sullen facial expression? That's what I want to know.
What do those Satanists do, anyway?