The After School Satan Club says it is a secular organization and its members do not actually believe in or worship the devil. According to their website, the club “does not believe in introducing religion into public schools and will only open a club if other religious groups are operating on campus”.
By contrast, the Good News Club, an organization sponsored by a local evangelical church devoted to spreading the word about the Bible, is allowed to host meetings on public school property.
Diabolical liberty: after-school Satanists club threatens to sue district over ban | The Guardian