Is there a polite way to tell someone you really don't care about what they are talking about??...

Ive always just been honest about how little i care. Might wanna try that one day.

You have to be polite to Jehovah's Witnesses at your door?

If someone knocks on my door and I'm not interested in what they're selling or want, I just say I'm not interested and don't open the door. There is nothing compelling you to listen to what they have to say, especially if you haven't invited them to visit.

i change the subject

Just tell the truth.

Ghandi said in all situations you have a choice; laugh, cry, get angry, walk away, or accept it.

You tell them the truth and the next move is up to them.

My mother would just talk about her religion and they usually didn't make a return visit.

My dad would start cleaning his guns while they chatted.
Same effect.

yep, I bet that would work too.:)

I usually lie :) and say I have something to do and no time to talk. I"m a coward when it comes to such things.

Changing the subject easily showing that you don't care..but if you want to actually tell them that you don't care,I guess there is not a 100% polite way in doing so.

Usually i say no thank you and then say i have things to do, and shut the door as fast as you can :D

i tell you story...

Biker friend of mine said after a long night of partying, windows blacked out, candles lit around the room, some JW's knocked...he was high off his ass and wearing a Black Sabbath t-shirt. When they asked if they could come in and share the word of god he replied with swinging the door wide open and said "Sure, come on in, we were just getting ready for Black Mass." He said they never came back.

I would politely change the subject

That really comes down to how you express it. Respectful dissent is normally taken respectfully. If not, it is then fine to close the door.

The word is MEH. :-)

You say " this is a conversation I would rather not have, if you don't mind" If they ask why, just say its a personal choice at the moment.

Sure there's a polite way, just say it in a nice manner. When it comes to JW's I simply say "no, thank you."

If it's someone going on & on about something that's boring or you've just heard enough. Get your foot in the conversation & sway it another way. If it doesn't work, excuse yourself if possible. Or say, can we talk about something else. But, yes, there's a polite way which should be used until & unless they are rude about it, then you too switch modes. :-)

you could tell them you are a nudist and to disrobe before entering...

say what you mean...
mean what you say-

without fear or regret-

As far as JW's or similiar, I don't see any duty to be polite. You have no duty to explain or in any way be concerned with their feelings. They intentially violated your privacy. So F off. Moreover, they use they very hesitancy within your question as a tool against you. They understand normal psychology is to be polite so they exploit that to get their looney asses in your home. It's build into their scripts. Think about that. It really should empower you to tell them to F off. I'm not just being profane. They deserve it. Actually don't be profane. It will just give them a rush that they were battling Satan.

As far as other people (people in school or weirdos at work) who simply don't interest you, I think you should disengage as politiely as possible. You're not interested; doesn't mean they are not people who deserve some respect. I am sure you will get many suggestions on how in reply to this.

Just my opinion.

You mention JW's. Many years ago they used to drive around in old rusty lime green Burlington Northern suburbans so you knew who they were before they even got out. A widower neighbor we had at the time saw two women get out of the vehicle and walk toward the house with books in their hands. He ran out the door full speed, dropped to his knees in front of them, looked toward the sky with his arms raised and prayed loudly: "Thank the lord! I ask for a woman and he brings me two of them!" That solved the problem of the visiting JW's. True story. You've just got to be creative!

I just tell them I'm sorry but I'm happy with my faith and do not wish to hear what they have to say.

Write it down on a piece of paper, fold it neatly and slip it into their hand then slowly close the door or walk away as they're reading. Oh, but make sure you add an xo or a smiley face y'know, just to be nice.

You could ask if you could talk about something else or that, sorry, but you really don't have or lost interest in the subject.

...But for JWs and such, I actually interrupt and say, "No thanks."

You can do what I do, "I have a sleeping disorder and have stayed up for 7 nights in a row, causing severe shock to my eyes, can you tell?" And then just stare at them with your eyes really wide.