I'm Atheist and have been my entire life I'm also sixty years old. AA is or at least has been part of my recovery, the first 3 or 4 months in AA I looked into God as we understand him and it led me back to my belief. I had one old timer ask me if I thought I was God, my response was that I can't possibly because I don't believe in God. I've been told that the person talking didn't believe that I was an atheist after I said I was, that's happened twice.
I do believe that everyone is entitled to believe what they do and I have stood up to people for mocking religion in AA.
I personally find strength in the people and there personal stories and the bonds you make very rewarding.
But I have found over time the oldtimers are quick to bring religion into AA and I'm finding it harder to ignore.