Get your own back. Push some blank pages through their letterbox and when they say but there's nothing there, shout back "that's right. I'm an atheist"

Eh, I get no kick out of being mean to the door-to-door religion salesmen. I've found that most of them think they're doing a good thing - they're obviously wrong, but wrong can still come from a good place. I don't entertain their nonsense, but I've found that a good "thanks but no thanks, have a good day," works as well as anything else. Plus, it doesn't foster the already prevalent misconception that atheists are a bunch of assholes.

When I was a JW, we used to be all over the place all the time. I never see my old buddies doing door-to-door anymore.