I don't know if I believe in God either. I believe there's something though. It could be God. It could be the energy in the universe. It could even be emotional evolution. Maybe the pull of evolution is not just physical, but mental and emotional as well. Maybe fighting against evolving as a human is so stressful that at some point a person reaches their rock bottom and has no choice but to embrace recovery.
There are all kinds of ways you can go about it, but try not to get too hung up on one minor detail.