To make Agony's excellent advice a little more specific, as a Religion editor I'd look at what body of knowledge is needed to answer the questions. If you give players the idioms and ask them to explain the Biblical roots, it probably belongs in Religion: The Bible. But if you talk about what the Bible says and ask the players for a modern Hebrew idiom, that sounds more like a World Languages quiz.
We like Bible quizzes to generally be answerable from nothing more than a copy of the Bible in hand, so keep that in mind if you'd like to slant it towards Religion. Another thing to keep in mind is that World Languages quizzes typically allow much more of the question to be written in Hebrew (or other language besides English).
Editor (Religion, Humanities, Music)
Just because there's twilight doesn't mean we can't tell the difference between night and day