Satanic panic stuff and thinking RPGs are evil is not a belief worthy of respect. Just because a religious belief is "genuine" (whatever that means), doesn't make it okay, not when you mistreat others because of it. That is particularly true here. Satanic panic stuff, which is fundamentally some superstitious sub-medieval bollocks with no real connection to the word of Christ, has been extremely harmful. A lot of people spent a lot of years in jail for wholly false allegations spurred by this stuff, and others have committed suicide or the like because of harassment and ostracisation connected to it. It is not "poor old grandma", it's superstitious trans-religious (ie it can jump religious boundaries) nonsense that hurts people.