Earlier quoted context omitted.
I doubt it's quite that simple, but this does seem likely to be a big factor. I say this as an atheist myself. Religion does seem to give people a purpose and a community that's difficult to find elsewhere, and that translates to happiness. Sometimes I wish I could do it, but I can't. While a fall in religiosity may be part of the cause, I don't think a return to religion is the answer. We need to find ways to replic…
I think this is a common reaction that I used to agree with but no longer. I think religion tends to capture something essential about reality that atheism excluded by definition. There's a reason no atheist society has historically arisen and thrived in the way that you are suggesting. If it was possible why hasn't it happened. The idea of atheism is ancient - why has it not worked?
We don't need a "society"; having one would be counter-productive, and would even probably be more like a religion.
> I think religion tends to capture something essential about reality
I think you have this backwards; religion tends to capture people who want to believe that reality is something other than it is.