Jews? Nigh 0%.
You don't seriously try to counter it with the question of jewish literacy rates, right? i mean, forget the fact i made that jewish remark only since its a common joke that jews only answer to questions with more questions and so this silly counter argument shouldn't even happen (and seriously, stop trying to counter valid arguments with anti-christian or anti-jewish arguments, its becoming pathetic), but, are you seriously trying to compare islam illiteracy rates with judaism?
Of course it varies by countries, so?
The muslim population, as a whole, has a literacy rate. find out what it is. find out what percentage of muslims who can actually read and write ever finish high school. find out what percentage of muslims have access to a computer with internet connection. find out what percentage of muslims can actually speak english. realize why there's relatively so few muslims who can answer questions about the quran:
1) The majority of them can't even read it in any language.
2) The majority of those who can read, can't read the quran in arabic (Which many of them believe is mandatory for reading it)
3) The majority of those who can actually read it, never actually read it.
4) The majority of those who can and have read it, can't communicate it with you.
hence. there's a very small minority of muslims who can answer questions about the quran and since they are probably not here, its pointless to ask "them" questions about it. (There is a highly literate, highly intelligent egyptian bay12er in the creative board, but i dunno if he is muslim though)