First of all, I forgot this before too, but this thread is about informing the player about who Shar is, not Tav. Secondly your point is about how Tav should know who Shar is, but our point is about how even if Tav knows who Shar is, that isn't the same as recognizing the trappings of a Sharist.
I live in Baldur's Gate, like most people I know that the great upheaval that took place a century ago was the work of Shar, magic ended for a while, times were hard, not so hard for my grandparents as they were for the wizards, but still. I personally have never seen a temple of Shar, nor have I ever met a follower of Shar (that I know of) I understand she is about darkness and hates the Moon (I know a lot more about Selune and her nice followers) but if you were to ask me, "What is Shar's Symbol", I might have to make a religion roll.
