Ted Gunderson is not a Satanist, but he has spent the last twenty-five years or so studying Satanism in America. There's a lot more of it than you think. Yes, with human sacrifice and the whole nine yards. Did you know about 50,000 Americans disappear every year for "unknown" reasons? FBI statistic. Many are the kids you see on the sides of milk cartons.
Ted Gunderson was formerly the head of the FBI in Los Angeles. So he might know what he's talking about.
Good intro page to Ted Gunderson.