Just so you know, AA isn't a Christian program, or even a religious one, in spite of the word "God" in the Steps.
I know plenty of atheists and agnostics in AA. I consider myself agnostic, and I don't have any issues with AA meetings or with the program.
Not trying to sell you something you don't want, but if that's all that's making you reluctant to look into it, it's not something you need to worry about.