Atheism is a lack of belief, a lack of doctrine.
As an atheist I follow a solitary path and chose to leave the concept of 'like-mindedness' behind in my family's methodist church.
However as an atheist I also understand the feeling of isolation and secrecy. The only person in my christian family that even has the slightest hint that I'm atheist is my mother; I had to endure "Don't you believe Jesus died for your sins?!" over and over
Back to the point, I think mixing the terms 'atheist' and 'church' does not make sense - however I do understand the need for support as an atheist and fully agree getting together with other atheists could be a breath of fresh air.
I have an advantage of many atheists/agnostics. I'm a rarity -- a second generation agnostic. So, my parents are perfectly comfortable with my not having a religion, not raising my son in a religion. No concerns for our souls, just lots for our health and well-being.
However, I don't think that we should HAVE to follow a solitary path, merely because we aren't mainstream. If you choose to, that is a different matter. Church, to me, is a sense of society, and not taking the dictionary definition, since words do evolve over time (remember when "gross" only meant 12 dozen?), I view the idea of an atheist church as a good one. The idea of a cohesive community, a support network (last thing I would want, should my dh die, is to have my support network tell me that he was in heaven, or that I would see him again after I die, the usual murmurings given at funerals) -- it's very appealing. Shared values that have nothing to do with religion... yeah, that is a plus. And maybe, just maybe, the theists would be able to see that non-theists do indeed have morals, values, ethics. I've never needed a hope of heaven or a fear of hell to keep me from doing bad things. (So, are their values less strong, that they need that external reward/threat system? I suspect, like anything, it depends on the person.)