My old place, you could get to the front door without being buzzed in and if I was doing a ritual, I'd put a sign "do not disturb", and the people who would always knock and continue to knock were religious door knockers or salespersons, then I changed it to "don't disturb, witch working magic" and the'd all but pound on the door, so one time I opened the door to them (luckily I'd just closed the circle), but I was skyclad (naked), I didn't appreciate that the first words out of their mouths were "devil worshiper". So I wasn't exactly nice about the interruption.

Other times, I've welcomed them in and gotten into a lively debate about their path and my path etc.

I don't have anything against them, or their various religions, but I'd prefer not to be bothered when I've put a sign up asking such.