I am in Colorado, and though I know a lot of atheists, what I seem to find troublesome is that without religion there aren't that many *structured* communities for us to be a part of. I grew up in church, and my parents continue to be active in theirs, and I can't help but be jealous of the fellowship they enjoy. I think it's hard because atheists, generally speaking, have little else in common! Religions can come with a nice, built in commonality that makes fellowship easier.
I am also finding it hard to be a part of mom's groups though. Around here, even the religious ones are fairly progressive and relatable in lots of ways, but I am not sure how to broach the topic when it comes up. I usually just get quiet and feel left out until the topic changes again.
We've contemplated starting some kind of Salon or "Atheist Sunday School" to have a place for discussion and community building, but I am worried people will think I am a wannabe cult leader.
Wherever we've lived, once we had kids, we've joined "Secular Families" groups through meetup.com. Are you anywhere close to Denver / Boulder area?