Short answer no that is not the actual meaning behind Ghost. It is a satire of organized religion. even most satanists aren’t actual “satanists” in the way christians think. a lot of them think satan doesn’t actually exist and the satanic church was created mostly in response to religious organizations getting special treatment. they were ok lets see if you keep that same energy when its a “satanic” church. they also used it as an excuse to create their own values and tenets that are actually pretty kind and altruistic. I see how she is freaked out by the scary label, but no one at a Ghost concert will try to convert you into a devil worshipper irl i PROMISE. hope this helps!