A recent edition of Five's 'Trisha Goddard' (not to be confused with ITV's 'Trisha' - that's a whole different show) was entitled "My Son's a Satanist". I watched it mainly to check that my mother wasn't on, but also in an effort to learn more about the beliefs of this shadowy subculture of society.
Fortunately, when the young man in question (I forget his name, but it might have been Damian) took to the stage, Trisha was straight in there attempting to get to the heart of the matter by asking him what his religion is all about.
His response was unequivocal:
"Satanism's like Marmite - you either love it or you hate it."
So that's cleared that one up then.