I've always found religion a bit annoying. You can really focus on it, and still not get the beliefs that you want to really make it effective for you. With that in mind, I think that piety could be altered to facilitate getting the religious beliefs you want by making them non-uniqe. Change the opener so that anyone taking piety can choose any of the beliefs, even if another religion already has that belief. This way going piety guarantees you the most effective religion for your situation, as long as you focus enough on getting the faith to actually found the religion, which is really facilitated with the second SP that boosts faith from shrines and temples. This would be a fantastic boost to the Byzantine UA too, and probably eliminate complaints with it.