I joined Co-Dependents Anonymous many years ago, a 12-step group. I don't see it as based around God, although a Higher Power is part of the program. My experience is we are a group of people who have problems with mood, self-esteem, relationships and are looking for ways to heal.
This concept of God can be God as you understand God ... for many that is the power of the
group community itself and not the religious God that many of us grew up with. I'm not particularly 'religious' but this group has changed my life. It has been the biggest denominator in my healing from depression/anxiety. Wow ... the things I have learned there ... I have a sponsor in the program who has been for many years my best friend and I have many other friends in the group. The meetings are $1 - what a deal for my sanity!
This is my just my experiece ... take what you like and leave the rest. I hope you find what works for you. If you do, please share it. I think most of us here at Psych Central are just trying to get better.