Marilyn Manson was brought up a Christian

In an interview when asked about his faith Marilyn Manson said 'My first memories of religion were being taken to Episcopal church. My father was Catholic, but my mother, I believe, was Episcopal. So I sort of veered off into the watered-down version of Catholicism.

At the same time I was going to a nondenominational Christian school, where I was taught a very underhanded form of Christianity… that was the point (14 years old) where I started to seek out other interpretations of God

Marilyn Manson: The Beliefnet Interview - Beliefnet