See, I haven't really encountered Mormons. However, I've been repeatedly accosted by Jehovah witnesses and the "Nam Myoho Renge Kyo" cultish people...
We have the Jehovah witnesses making rounds now and then. I wouldn't mind, but if I say "no thank you" that ought to be enough. Actually, the various signs we have at the door indicating that we prefer to not be bothered by this stuff ought to be enough. My last encounter went like this:
*DINGDONG* (dog goes nuts, we are obviously under attack and she knows it)
Hello. (Boo: bark bark bark)
Have you heard the word of the lord today? (Boo: bark bark bark)
No thank you. (Boo: bark bark bark)
*Slight hesitation* There is a lot going on in the world you know...(pamphlet with the planet earth on the cover extended to unopened outer door) (Boo: bark bark bark bark)
Yes, I know, but no thank you (Boo: bark bark bark)
If we could have just a few moments to tell you.... (Boo: bark bark bark bark bark)
No thank you, I'm a bit busy right now. (Boo: bark bark bark)
Don't you care about the future of the world? (Boo: bark bark bark bark bark)
No. Right now I care more about the laundry I'm trying to get done. (Boo: bark bark bark) (Outer door shuts)