Out of curiosity what are the specifics on your brother? I ask because I can't imaging anyone who has made a success out of their life for the past 15 years away from this dreaded cult ever considering going back to it.
My guess is that he has little to no college, is lower middle class and struggling financially, has difficulties in maintaining quality relationships and finds it challenging to discipline and control himself in what he eats, drinks, ingests, how he spends his money . . .
Wow DJS do you know him?!! At 18 years of age because he didnt have to go to the meetings anymore he didnt. He went out clubbing, drinking to excess, smoking, dabbled with drugs etc etc then the drugs screwed him up and he ended up with mental health issues. If he doesnt take his meds he claims he can "hear what people are thinking" or "has met many people from history in another realm" - yes he's messed up .But when he takes his meds he's fine.
All the time he made the occasional visit to the hall but never committed to it. Now that he's in his mid-late 30s he's looking for direction and purpose. He's very much into sci-fi and loves the idea of alternate realities and other dimensions and time travel etc. So this new crap about the end of the world and living in a bunker is music to his ears.
I dont think he'll take the plunge and get baptized. He'd last 2 weeks tops before he lights up another ciggarette, get DF'ed and he'd lose his entire support system (his family except me) and would most likely kill himself.
Sad, but true.