I have a character who's gonna be written through a transition. He starts off as a "saintly" pastor who's very docile. He's very religious and he clings to his religion because of his horrible drug addicted past. But as I develop the character as he goes through a tale of gods, angels, and demons I want him to regress instead of progress. I want the character to start getting fed up with his passivity and his dissatisfaction with his own life and proceed to drop his beliefs and all hopes of redemption and eventually become a villain himself. A nasty one at that. But would this ruin the appeal of the character? Having him developed for so long only to take him away and make him the antagonist?