Didn't Lennon sing of a world with "no religion too" in Imagine? Wouldn't a Lennon-centric religion be a little hypocritical? Though, I suppose the Beatles were "bigger than Jesus".
Satanism doesn't make any sense to me. For someone to believe in Satan - they'd have to believe in the Bible - and if they believed in the Bible, they'd know that they would go to hell for worshiping Satan!