I did appreciate the 'Keeping God simple' approach when I entered AA. 12-step programs in general try to keep the concept of God easy for new members because when they first come in, they need not be scared off by thinking that AA is a cult or religion. Some have been hurt badly by organized religion before they enter AA.
Some are angry at God. Some have been damaged by shame and that they have lived in sin. Alcoholism is a damn disease and there should be no shame in getting sick.
AA has to also make room for the atheists and agnostics that enter the rooms looking for acceptance and recovery.
The 'Higher Power' or 'Power greater than ourselves' concept is pretty easy to grasp for most people. A moment of silence followed by the Serenity prayer usually begins the meeting.
It can be accepted by a wide variety of backgrounds and cultures around the world. AA is successful on an international scale and has spawned many other 'anonymous' 12-step recovery programs.
AA's spirituality pretexts originated from the Oxford group:
https://en.wikipedia.org/wiki/Oxford_Group Prayer is said to be our highest function as humans. The Call to Prayer in any language for any religion is beautiful to hear.
I came in and believed for the first time that something had interceded in my life. Something lifted my compulsion to drink (and it certainly wasn't me). Something turned hopelessness into hopefulness.
It has been 27 years since my last drink and the journey continues as I trudge along the happy road of destiny.