Plenty of covens would smile at that. So does their master.
To most secular people it sounds strange to refer to Satan as a real, active being. As you point out, he has succeeded in convincing people that he's not real. That at worst he's some cartoonish person with a red costume and pitchfork. So if you don't believe in the reality of Satan, there's not much reason to turn to Christ for protection.
Maybe they’re in on the joke too?