It’s expository but you have your story weaving in and out of it, which adds legitimacy and shows your intimacy with the subject.
And similarly, it is written as an academic paper, but remains informal enough to allow the narrative to peek through. It’s very approachable, I’m confident people unfamiliar with AA will find it interesting and easy to read…not to mention all of those atheist or agnostic alcoholics who stand to gain something from your observations and experience.
You really had your audience in mind when you wrote this; really sought to add value for them.
Also, I think your title/subtitle combo is well thought.