Listen I know they’re annoying, but the people standing at your door aren’t the problem. It’s the cult they’re in.
Telling them there’s a demon in your house is likely to cause them a decent amount of psychological distress. They literally believe in demons, they literally believe those demons want to get in to their home, and they literally believe it will destroy their life, get them kicked out of the cult, and separated from their only support network. Even though you and I know none of those things are true, (well, being disfellowshipped is a real thing) they believe they are and it’s going to fuck with their head.
That said, they won’t stop unless you scare them away, and that’s probably the most harmless way to do it.