Whenever these guys knock on my door its usually pretty early in the morning, maybe 9AM or so. The men are often wearing a suit and tie and the women are in a long dress and they're usually pretty polite.
My wife just tells them we're not interested but one day I will get a chance to talk to them and point out all the nasty and atrocious things contained within the Old Testament, politely of course.
Until we meet again...