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This should spell out for those who don't know whether Black Sabbath were promoting the devil, or just exploring themes...both Geezer Butler and Ozzy, in this article, talk about the early days of the band when devotees of black magic and Satan would follow them at their shows, and ask if they would perform at their rituals. They said no, and apparently pissed the Satanists off...as Butler recounts it, they got a call from a "white witch," who told them a Satanist had placed a curse on them, and they should use crosses to protect themselves...hence, the crosses you see until this day...Ozzy, by the way, said the only evil spirit he was interested in was booze...here's more https://ultimateclassicrock.com/black-sabbath-wear-crosses/