I think it allows you some control over interactions between characters and perhaps advantages depending on who is talking. Recall the latest and last panel from Hell with Shadowheart talking with the mad doctor (Malus Thorm), because she is a cleric of Shar the man was more favorable predisposed towards us, didn't stop him from trying to 'cure' us but totally to be expected from a zealot of Shar, one of the most evil beings in the D&D setting.
