A poster on an "open" RF thread like this can say that a particular belief, diety, religious authority, etc. is "Satanic." But he must not say "You are Satanic." That would be "making it personal."
The Bible is always a legitimate source on the Religion Forum, so a poster might quote the Bible where Jesus called Peter "Satan." If his post serves no debate purpose (flame bait or 'making it personal' by devious means) - it would be pulled.