Jacob's lineage goes all the way back to the original bigwigs of New Jerusalem and, to be honest, that's the only reason why he hasn't been kicked out of New Canaan. Jacob swears under his breath, mumbles prayers in church, and is otherwise not a very good Mormon.
The truth is that he never had any faith to lose. It's not that some trauma made him disbelieve what the priests told him - he just never accepted it, to begin with. So, he keeps to the area around the Union Station so the other Mormons won't give him dirty looks.
He often goes out into the ruins of Ogden and collects bits and pieces of junk to re-sell. He rides a fine line on New Canaan's weapon policies, often selling disassembled pieces of complete guns and pieces of armor.