Firstly I'm not trying to be a contrarian, I do think a Religion check to recognize her 'uniform' as significant is called for, what I'm trying to convey here is that, firstly taking things for granted based on so called 'continuity' shouldn't be the basis for storytelling here, none of the continuity is 'real' nor is it above revision.

Secondly being aware of Shar is not the same as being familiar with her iconography, to continue the Crusades as analogy, knowing the iconography to the Western and Eastern Churches, there's a clear front facing iconography there that is clear to anyone outside and inside, but ask a Muslim to recognize a fish symbol? Or a rosary?
[Linked Image from upload.wikimedia.org]
Notice anything about Mary's shawl, roll for Religion.

This is a Saint
[Linked Image from 4.bp.blogspot.com]

Using Islam isn't the best because of its inherit iconoclasm, but more apt analogy would be how much you'd be able to recognize the iconography of a sect within Islam, an infamous one, the Assassins, a Shia cult that had to go under the radar because of it's own success.

This is similar to what I was getting at with my Cult of Isis example. Being well known is not the same as being recognizable.