I don't say anything as it's none of their business, just as I don't ask them.
I do however harass street preachers..

I don't.

Honestly, I think it depends on the setting, if it’s a stranger or a loved one, & if you’re in a situation where you could lose your job or something like that. If everything is in the right circumstance, sure! But if you could risk an important relationship or a job opportunity, I’d say no. But if you’re comfortable saying it, I would try to make it not sound like an attack. But don’t sound ashamed either. Make it sound like you’re talking about the weather. Their reaction is less likely to be over the top if you do it that way. & if they don’t like it, well. That sucks for them. You deserve to be happy, your lack of conviction of whether a god exists shouldn’t be a precursor to that.

I usually don't, it isn't any of their business.

When I tell anyone I am an atheist they argue with me. Try to convert me to their views. It's not going to happen. I have been thru too many religions on my search. Been baptised 3 times, in three different religions. It is impossible to believe their dogma.

I usually don't find it necessary to bring it up.

When people start talking about their religion, I simply say "I don't believe in God" and walk away. I don't like debating with religious people, especially in groups because there's power in numbers, so I walk away.

I have a similar thing over being gay and transgender. I want it to be 'out there.' I don't especally need it to be a regular topic of conversation, I just don't want to feel like I'm hiding it.

My solution is wristbands. I wear them pretty much 24/7/365. One for Pride, and one for Sparkle (basically a UK transgender pride.)

There is an atheist symbol. There are various jewellery items available that display it. My recommendation would be to get one of those and wear it the way a Christian might wear a crucifix.

[amazon.co.uk]

When I want to go soft on them I say
"I am not religious"

Otherwise I just say I'm agnostic.

In real life you only discuss religion and politics if such a discussion is invited, and you're still free to opt out. In a quarter century outside of theism the topic has only arisen twice. Once one of my surviving older brothers asked if I no longer believed in god. I responded that I do not. He said that's too bad, and never brought it up again. The second time is when I was introduced to a new circle of guy friends where there was already an "outed" atheist, they sensed the same mindset in me and asked if I was atheist and said yes. I was accepted into the group anyway.

So in everyday life I don't meet theists or atheists, I meet neighbors, acquaintances, colleagues, and the like.

Online is a different story. People come to places like this specifically AS atheists, agnostics or whatever, often for the specific purpose of discussing and debating these matters. Special case.

I don't. I stress that I'm an agnostic. It works for me.

Up front. Usually in the first or second conversation. If they don't understand or respect me then fuck them

I only tell good friends that I trust. On occasion, if a group is trying to convert me at my doorstep, I will say I am an atheist, it seems to make them scatter. I have had a couple bad experiences with bullying when I have had people try to pull out of me my belief system, I keep quiet about it in real life.

I had a missionary ask me if I had heard the good news. I just told him I was a philosophy major. Then he walked away. So I guess that works?

It they ask ... I just tell them . Most people couldn't care less, if they do care or are ' offended' in some way , I don't care anyway .

I never bring it up. If I'm asked about my religious beliefs, which rarely happens, I tell the truth. I'm an Atheist. Theists are usually curious but so far have not been judgmental.

One method is simply asking: you believe in jesus what was the reason that convinced you of jesus?
Generally once you ask this question they have an idea you don't really believe.

Only way to find out is, suck it and see, make it a learning exercise, research, that way you won't be quite so thrown when you get a load of nutterguff back. I only tell these days if I am asked and if I have an imaginary bullet proof vest on because it is absolutely of no consequence to me, what I am not. I don't really see why its of consequence to anyone else - I'd love to just answer completely off key and wacky like 'yes I do always wear white knickers'

Sexual pecadillos between adults are are none of my business, nor IMO anyone else! The 2 women you mention, history I have Never heard that version before, and who was fired, exactly, for "ordering her to the motel "????!
Plus they seem to both have made aplenty of money both during and since then. And I say this as one who absolutely believed Anita Hill from the get-go.

I just tell them that I am not a Christian. Strangers have no right to know what I believe but if I am put in a situation where I must discuss, I am honest. They either walk away or they don't.

I don't. I listen to what they have to say and smile. Never do I agree with them or even try to get into a discussion about my beliefs or the lack thereof. It is a personal choice and frankly, none of their business. I'm not ashamed of being agnostic nor do I go around trying to convert or change peoples minds. Live and let live...to each his own...etc.

To their face. If they don't like it, they can go back to the Garden of Eden.

I live in the South. Only if they ask "do you believe in God" I tell them "no" and let them deal with it.

I just say I don't think we have much common ground, or at a push I'm a fallen Catholic lol

I fervently wish to go back just 20 years where people kept their business, political or religious, to themselves!