Blimey. I've seen dogs give up on bones more quickly than you do with this topic.
I can't speak for others but I have only ever been to one meeting vaguely connected with the umbrella term you appear to use for anyone who expresses the slightest doubt on the subject of religion. That was for a meeting organised by Skeptics in the pub or some such title.
It was full of what appeared to be generally well-meaning types who would normally be found in the real ale pub it was being held in anyway. Was it a community? Possibly a CAMRA card carrying one.
I never went back, wasn't my thing. The only interaction as an atheist I have is with some of my friends and people on here. So for me, there really isn't one.
I don't rely on Lawrence Krauss or RD or anyone else for my views on atheism. It feels to me internal, I suspect rather like religion does to others. I'm not saying it is a matter of faith, rather that I cannot accept the obvious (to me) failings and flaws in the thoughts of you and others who continue to try to persuade me of the rightness of your cause. I purposely use the word "cause" as you clearly have an agenda to promote.