Garyneal has a point but. . .
he has yet to get his first job, wants to go to every meeting, does not have a good sence of reality and is overall just like his mother. I love my wife, but she has always been taken care of either by her parents or me
it doesn't sound as if he'll be easy to dislodge. Yet it can be done; my youngest was similar but has now moved out and is earning a living. Perhaps, in your wife's avbsence, appeal to what interests him. Does he enjoy music and concerts? Would he like to have a decent car? Travel? Does he plan to marry one day?
Present financial independence as desirable - which, after all, it is. Then discuss a plan and motivate him. No pocket money or handouts, he needs to earn it! By all means involve the older brother and anyone else who might help.
Leave the religion and meetings right out of this. How could you be Satan when you're just enabling him to become the head of his own household one day?
There's a good chance that as he develops a life the meetings will become less important to him.
Good luck, Retro