I will venture in and hope this is helpful. I don’t have personal knowledge of AA. I am a Christian now, although I was formerly an atheist.
When I was an atheist, I studied a lot of sociobiology, which as I understood it at the time boiled down to “evolution explains everything.” However, as I reflect back on it from my new perspective, it doesn’t seem like evolution explains things all that differently than my current faith does. Really. So I am chiming in to say that evolution/ natural selection quite possibly could serve as a higher power. Whether one says that squirrels were “designed” to store nuts for the winter, or that squirrels have been fine-tuned by the laws of physics and the chemical composition of planet earth to store nuts for the winter, doesn’t make a whole lot of difference unless you are arguing about creationism. If you are actually trying to do anything with squirrels, you’ll get about the same results.
I do think that the level of certainty in your own knowledge of the lack of God’s existence, to the extent that would prompt you to stop others in their tracks and try to correct them, probably needs to go for your own mental health. Can you at least aim for the kind of agnosticism where, although you don’t believe in God, you wouldn’t take it as a personal affront if some evidence consistent with the existence of God emerged?
You might find this book interesting: Spiritual Evolution: A Scientific Defense of Faith by George Vaillant. He’s a physician who has spent a career in academic research. The book focuses on connecting the evolution of brain biology to the experience of spirituality.
I do wish you the very best in your efforts toward sobriety and hope you find the right community to support you.