How Christians read the Old Testament has always been a matter of some controversy. Not, however, until the rise of fundamentalism have moral questions about Old Testament the stories of genocide been particularly pressing. Contrary to what one finds in the more brutish anti-religious polemics, it is not the case that Christians have always read the Bible as the straightforward documentation of facts about the past, only retreating in modernity to metaphorical and spiritual readings in modern times.
Fundamentalism, however, is a demonstrably modern phenomenon; whereas sophisticated spiritual, typological, and metaphorical readings of Scripture stretch back to the beginnings of Christian exegesis. In considering how we should read the “hard passages” of the Old Testament, less literal approaches are often the more traditional.

