I never understood the "god can be anything you want" line. Five of the steps involve accepting "god" as an authority over your life, including "His will for us" and the power to "remove all these defects of character". It reminds me of Henry Ford's infamous "any customer can have a car painted any color that he wants so long as it is black"; i.e. you can have any god you want, as long as it's at least a metaphor for a personal god that deserves authority over your decisions and well-being. Your brother might have no problem with that sense of authority, but plenty of atheists do (e.g. believe that if Yahweh existed, He would be a tyrant undeserving of worship).

You can reduce those to the authority of the laws of physics, if you want. Try defying the authority of gravity, for example. Then, have faith that the laws of physics will work in such a way that your brain will be altered and addiction no longer so strong.

How does physics "remove all these defects of character"?

It's accepted physics that all defects of character will be removed at the heat death of the universe :)

Removed, or frozen in perpetuity?

The only way to alter one's character are through physics, presumably.

True, but predatory church groups abound. Motivations for helping people with addictions ranges from compassion, to dispassioned dominance and exploitation, with most being somewhere in between (money). This is not to say that they are all bad, but peverse incentives seem more common than most industries, even when the intentions are noble.

Exploitive and dominance-motivated people exist in the medical sphere, as well.