Reading the official forums, I find myself reinvigorated to make my module. I see a few posts from people who are just so desperately saddened by Bishop's plight and their inability to save and redeem the worthless idiot. This was a theme I wanted to touch on in my module.
Here's the plan. You'd eventually come across an evil sadistic ****. He'd be forced on the group for either a token small time or he'd never be forced on the group. You could "redeem" him, make him turn away from his evil deeds. After a short period if you choose this path, he starts to be punished by his old vengeful and very angry evil god. A plan is presented to the player! What if you get him to accept a new good god to protect him from the old evil one? So, you enact the help of the local Paladin who reluctantly plays along. The Paladin puts in a good word with his church who takes the former evil guy in. A short time passes and the former evil guy is kicked out of the church on his butt for trying to defile some nuns, the Paladin is kicked out of his order for his association with the evil guy, and the evil guy is still tortured by his old god until either he goes on a killing spree and returns to his old god or dies from the torture.. The Paladin ends up becoming Chaotic Good and bitter for the rest of the game.
The moral of that sidequest? He's evil, you moron. What did you think would happen? That he'd change his ways and gain newfound respect for life and people with a good pep talk?