Did you lose any friends because you decided to be an atheist? Did your family flip out?
I can happily say that I didn't outright lose any friends... a few acquaintances from the church I was attending before I became an atheist simply reverted to ignoring me or giving me dirty looks, but none of my true friends totally dissed me... I feel like it's because a lot of them understand what it's like to "come out" in a Christian community--be they LGBT or non-Christian or both. Those of us with "alternative lifestyles" here in Louisiana gotta stick together, after all. :] There are many friends I simply didn't bother telling... I don't feel like the whole world needs to be all up in my grill.
When I was a Christian I had an accountability partner, and he was absolutely, unequivocally my best friend. We shared absolutely everything with each other. Our relationship has suffered since I became an atheist, and that's really sad... but it happens. He's moving off for grad school next year, and I seriously regret not trying to connect with him these past few months. He's a dedicated, hardcore Christian, and I no longer ascribe to or support those beliefs--but I will always love the crap out of that boy.
I was outed to my family about a week ago, when my mom read through all of my private messages on Facebook... I was super mad at the time, as were my parents... but we've talked through everything. They, of course, are blaming my atheism on my boyfriend and swear up and down that it's "just a phase" and that deep down I still believe in the Christian god. They can believe whatever they want about my atheism, honestly... we've agreed to disagree, we don't bring it up anymore, and my boyfriend was able to be a part of the conversation. My grandmother and my uncle also know... and they've been nothing if not accepting and accomodating.
I've started being more open about my nonbelief, and my grandmother and I have gotten into a few heated debates on Facebook (haha), but it's all respectful. It's really nice to be able to express my opinions as an atheist without fear of being "found out."
I was pleasantly surprised by my family's reactions... and I'm so relieved that I'm finally out! :]