I took a class in Greeks this year; we read Oedipus Rex, and the various Greek gods came up. I started spouting about Poseidon and Athena and Hades and their relationships and so on and so forth, leaving great gaps of history out because I assumed everyone knew the story of Athena's birth, for example. Turns out not everyone did; a good majority of the class knew no Greek myths.
Bar only one or two, all of the people who were familiar with the classics?
Got their knowledge from D'aulaire's as a kid.
And, by the way, thought Hermes was a stone fox.