May already be in place. Having the same deity as that of a cleric turning undead should give you a pretty huge bonus to recognizing it. /blah blah
Quite likely factors like similar alignments should also do that, while factors like opposing alignments, racial pantheons, and such, should give you a penalty. But anyway-
It would be odd if you were a worshipper of say Oghma and couldn't recognize any of his symbols. :p
It's already implemented.