For the Are the elders experts on the bible question: LOL!
Also, my personal experience. . . .
Well before my apostacy (we're talking over 15 years ago now), before I was appointed an elder, but well on the "elder track," I said to myself: I really want to know everything I can know about the bible so I can give an educated answer to whoever asks a question. I was especially interested in being able to explain "deep things" such as how 1914 was arrived at.
I bought a book dealing with the bible and archaeology. In it, I found a shocking error: that Babylon had sacked Jerusalem in 587 BCE! Further research at the library (and in the Insight book) revealed that ALL historians had been duped in to believing that this event happened in 587, and not 607BCE.
And in the back of my head, a little voice said, Well, if the date really was 587, then it is quite possible everything you believe is false!
So my cult self took that little voice in the back of my head into the woods and shot it.