How open are you with your Atheism?

[Casca]

At my full time job, I've mentioned my Atheism twice, in the last four years. Two different people I trusted, and knew that they wouldn't think it was a big deal. But my workplace is absolutely loaded with the religious. One of my part time employees works as a chaplain at a hospital. Another person whom I have to coordinate with everyday practices memorizing bible quotes on her lunch break. So I am under no illusion that for my own benefit, and to avoid conflict from a lot of people, I keep it close to the chest, and just don't join conversations that involve religion.

My personal life; my friends, family, and my wife know that I'm Atheist. Most of my friends couldn't care less. My dad has become more and more wildly religious as he ages (My wife is pregnant with our first child, and I'm becoming paranoid that he's going to try and baptize our daughter when we're not around). So he's not thrilled with it, but knows that if he pressures me on it too much, we'll probably lose contact, because he knows I won't put up with anyone's religious harassment.

My wife wasn't Atheist until we started dating- when I told her I was before our first date (I get it out there beforehand now, due to issues that came up in previous relationships), she actually didn't know what Atheism was. She was on the fence, and while I wasn't trying to recruit her or anything, she just accepted reality because of one conversation that involved me asking "where's the proof?" Ironically, she has a tattoo of a cross on her ankle that she got when she was 18, because in her words "I was young and dumb." I pretend it burns every time my hand touches it.

How open are you about Atheism in your life? Does it ever come up?