Ok, this poor kid is only 19, married with two kids. That's a LOT of responsibility for ANYONE. It sounds like he's had serious anger issues for some time and also has issues with strong women (considering Russell's behaviour, I think Brandon's issues are probably associated with the way he was raised). He's trying to change, by "curing" himself with religion. I respect the fact that he's trying to change, but some serious therapy would be much more beneficial.
That said, I am FURIOUS with TPTB at Survivor who let him through the screening process. It's simply wrong to allow this kid to destroy his life on national TV just to pander to the audience's baser instincts and build ratings. There is such a thing as common decency, plus allowing Brandon through placed others in jeopardy - the kid is obviously not stable.