I feel like in some ways that's a limitation of the game not the RP though. Like the game is clearly stating you will not have a character that shit-talks gods. A good DM would see your RP choice and play into it rather than stomping you cold for a simple character personality. It's equal to saying "you will never play a dumb comic relief". Where in a lot of good RPGs the dumb comic relief is the best option. In the same way I've seen a lot of people want to play god-worshiping characters that lose faith in their god and switch.