It is tough for agnostics and atheists in AA. At first you be encouraged to continue to come but they hope you will find some higher power.
I have heard numerous disparaging comments by AA members towards Atheists and Agnostics in AA.
I am not a member of AA but I use to go, I occaisionally go back for a friend's medallion. I attended the last International AA convention in Toronto and I went to the Agnostic/Atheist forum. I heard many people complain about the closed mindness and non-acceptance by AA members.
I am not saying you can't go to AA and be an atheist but you had better be a strong person with a tough skin.