If possible answer the door naked.

I am chuckling on this one as it brings back a memory of how I chose to deal with a very persistent group of door knockers. My boyfriend and I had just moved in together and we started getting door knockers right away. I tried being nice. I tried being cold. I tried being rude. Well, with one particular set of door knockers (JWs), they would not take "no" for an answer. They just kept coming back for more. One day I was cleaning and there was the knock at the door. I could see who it was through the window. Frustrated and not just a bit angry I went to the door and threw it open. They stood there with their mouths open. One turned away immediately, seeing that I was not clothed. The other young man stood there staring (not at my eyes) for a minute or so while I told them off and invited them not to return. They did indeed leave and never came back. Now, I do not share this suggesting you do this as it could land you in jail. Just sayin'....

I thank them for their dedication to their beliefs and tell them I respect them for the effort they are putting forth and ask them to respect me for my beliefs as well. I have often felt that the non religious could get better results with kindness. They already think we are stupid for our lack of belief, do we need to be thought of as a$$%^&es as well because we attack them? I try to stay calm and explain my opinion. I hope I plant a seed of doubt.

I would hand them a copy of The Hitchhikers Guide to the Galaxy and a towel, and wish them good day and good luck

Say "Sure, we can discuss (god, religion, etc,) after we discuss your sex life. That's just as much my business as my religion is yours."

I am very civil to them at the beginning and engage them in conversation opposing religion, if they get to sassy I insist they leave. After a couple of visits the word spreads that its a waste of time to come knocking on my door. I am very proud that I had a great deal to do with a young married couple leaving the j-dubs and becoming atheists.

I ask them if they believe in reincarnation. They never do believe, and that usually stops them cold.

Don't answer the door.

Have you heard the good news? There is no God and we are the masters of our own destiny

With door knockers, I tend to deal off the bottom of the deck.

I invent a religion and tell them all about it. Usually they cannot wait to leave.

I politely decline. I don't get into a conversation with any of them.

In my underwear.

I ignore them. I only answer my door if I have invited someone over.

Don't want you to waste your time. I'm just not interested. Shut the door.

I politely school.them on the bible they are professing to know. Present them with questions they are unable to answer. Most will not return. I had one group of witnesses that would come every couple weeks they got to know my name. I enjoyed teaching them new things every few weeks about their religion lol.

I really can't stand them they'll force you into their religion

Why would you not be civil? I have found them interesting to talk to, usually keep them longer than they wanted to stay.

I had a friend he would see the Jehovah witness approaching his door, he answers the door in his underwear. Not sure this works for everyone. I would answer the door tell them about a few uncommonly known subjects. Like the earth and moon were equal in size until they collided and formed what we now call the earth and other unusual facts. They made it a point to walk on the other side of the street when they walked past my apartment .

Depends on my mood and time: can be gentle, Often with amusement. Sometimes abrupt,

Bring them inside and explain why their beliefs are unfounded until they lose faith or are convinced I am Satan incarnate.

Nice polite people: no thanks I am a Buddist.
Pushy obnoxious people: get off my property and never come back!
The worst was on a cold, blustery winter day, temps in the low 30's with major wind chill. Huge guy in floor-length heavy overcoat, boots, scarf, mittens came to my door carrying a tiny little girl, maybe 4, wearing nothing but a pink party dress & dress shoes with ankle socks. I told him if he didn't get that child into proper outdoor clothing in the next 3 minutes I was calling the police. Apparently Gawd wants children to get frostbite so my soul will be saved?

Coldly

I just tell them I'm agnostic. Had one lady say "Well we know some people who have had experiences that led them to believe that way" and I wanted to say it's more about what hasn't been experienced but oh well. Mum used to say she was Catholic, that seemed to work the best.

I live on an island and am spared Door-knockers. However, some time ago I did find a pamphlet from the local 7th Day Adventists by the door. I took the pamphlet along with a recent FFRF newsletter to their hall and left them with a message of thanks for sharing their info. and I am returning the favor. No more pamphlets.

My late partner would actually go after business people for leaving copies of their religious beliefs in the waiting areas and she often would take this material and hide it. Sometimes I got a little nervous being with her but learned a trick or two.