One of my best friends that I met in Al-anon grew up agnostic but she didn't let the God thing intervere with the lessons of the 12 steps. She subsututed the word universe or a force greater than herself. I am not religious either but I have come to believe that addiction is more powerful than me and that I am powerless over it ( and most things really) A lot of people stumble with this. If you can get around this block you will be amazed how the steps can teach you a new way.
There are also adult children of Alcoh. (ACOA) mtgs. that work the steps.
You are in a difficult situation but the 1st part of change is seeking it.
Welcome.