I'm an atheist/agnostic, been in AA for 5 years and sober for nearly 3, so yes it does work. In that time i have met many atheists in AA.
You neither need a Christian concept of God or religion to be sober in AA.
Stick around, read alot, post here and whenever you are confronted with that word 'god' put your own understanding on the word, rather than somebody elses.