Answer:
Marilyn Manson is technically a Satanist! He was a part of the Church of Satan (A reverend actually) and used that in his first albums. I don't think he a is part of them anymore, but he does still use those past connections in music.
As for Rob Zombie, even if he wasn't a Satanist I'm sure that spread around that anyone part of the Shock Rock genre was one bc Manson (though I could be wrong, and please correct me if I am)
Step-by-step explanation: