Usually I'm all up for Larian giving us (or not removing from us) opportunities for roleplay.
But the problems, in giving quests to all these classes with patrons (whether they are deities or not), are that :
a) this would (probably) mean way too much work for Larian. I don't have in mind right now how many gods they have included already, but they should probably double that number if they want to give a fair sample of gods. Each god would (in my view) need to have a different quest ... the amount of content to create just explodes.
b) this would restrict a bit the player's freedom to choose how their character interacts with their deity. Not all clerics of a given deity are the same.
So, I doubt this be a thing Larian will really consider doing.