I will share my personal experience with Alanon meetings and literature.
In the literature I have, God is often referred to as HP (Higher Power). (some folks substitute the word HP with God or Jesus when reading)
I live in the Bible Belt of the US. At my meetings, most everyone refers to their HP as Jesus. They give thanks to Jesus when they talk about their victories.
I am not a Christian.
I take what I like and leave the rest.
I had reached a point in my life that I could not take another minute of the anger and resentment I felt at being around him (my AH). That hour long meeting was my santuary. I was able to escape the tension in my home and sit in a room filled with love and healing strength. That to me is the spiritual aspect.
The power to rise above and do things I did not imagine were possible is my HP.
I affectionately refer to my HP as my Hewlet Packard - because it can do things for me that I can't do for myself!
Whatever you choose, I hope you find your peace.