Very bluntly said, a new noble seeks to become a region lord in the shortest way possible (or some other title/position).
If all you are after is min/maxing your character, then the religion aspect of the game is not for you. It's just that simple, and nothing can change that. Period.
If you are looking for more
character development, as opposed to just
stat development, then the religion aspect of the game can help. But you, the player, must bring something to the table for that to happen. More than likely that will require your character to do things that are non-optimal on the
stat development side.