Peter Enns has written in his characteristically provocative style about two issues in the Bible that are really important but not at all clear.
The first has to do with Israelite origins. We can be reasonably confident about the broad outline of Israelite history back to the reign of David, but earlier than that things are decidedly murky. “Historically speaking,” Enns writes, “we really don’t know where the Israelites came from, and the exodus and conquest stories, which are so central to the biblical account, are particularly problematic.”
The second issue is of a very different type: “Why did Jesus die?”