Freedom From Religion Foundation is fighting to keep church and state separate - and they are swamped with issues all over the country. (Seems HS athletic coaches really like to proselytize to their teams, for one). They have taken on the Gov of Texas, and many more with astounding success.
GO FFRF.org !! The small fee they charge for membership gets you a monthly newsletter that has a section called 'crank mail' where they publish some of the mail they receive - worth the fee in itself! Here is the link, I encourage anyone that is unfamiliar to check it out. [ffrf.org]

It was an FFRF billboard in NYC that finally pushed me over the edge to announce my non-belief and be proud of it! I also just discovered "Friendly Atheist" from a link on this site and will be checking it out as well.

This is the only one I frequent.

In FB I am part of two Atheists groups...one has members from different countries and the second only from Argentina.

"Science, Theology, History and Philosophy Discussion" Facebook group

Just this one so far. I’m struggling with finding other sites I’d feel comfortable being. Like that picture, by the way lol.

I am a member of OMAHA - Omaha Metro Area Humanists Association, also an inactive memeber of REASON (Rationalists, Empiricists And Skeptics Of Nebraska)

Atheist Republic - Atheist vs Christian Debate Center - A Science Enthusiast - Alternative Science - Pantheism --- There is a lot of action on A vs CDC but it's mostly just pissing contests.