I've posted this before (a long time ago), but it's relevant.
I grew up in a large mormon family (is there any other kind? LO!), and was summarily kicked out of my parent's home when, at 16, I announced I was gay.
Anyway, I had the same problem as most LPSG-ers have posted, but mostly with mormon missionaries knocking on my door at 8:00 AM on Saturdays. For years I just slammed the door in their faces, but they are trained to expect that as part of their "missionary experience" and I'm sure I was on the local missionary center's list for "Go here to have door slammed in face."
One afternoon two perky, clean cut young mormon men showed up. They introduced themselves and asked their standard "golden questions." I told them to go away. But they persisted. They even pulled the old, "But it's so hot out today, couldn't you offer us a quick glass of water?"
I was wearing just my boxers and thought for a moment. "OK, why not." I said. There was already a VHS tape of seriously pig filthy pre condom gay sex tape in my VCR. As I led them into the "family room", I clicked on the VCR/TV and went into the kitchen. When I came back with glasses of water they were no where to be seen. And they were rude enough to have left my front door open.
They never came back or bothered me again after that visit.
Mormon missionaries will deny this, but they mark homes (the curb, window sill, top of your font door frame, whatever) with a recognizable sign regarding who lives in your home. The Elders representing the local ward and "Bishopbric" do this same thing. It lets them know if you're friendly, Republican, worship Satan, a Baptist, gay, etc. Next time any of you LSPG-ers scare them off with a shot gun, check the next day to see if there's anything "different" about the front of your house or front yard, sidewalk and curb.