Mainstream American Protestantism is suffering from an identity crisis. We are not fundamentalists, but it is easy to define ourselves in reaction to them. Paralyzed by the shock of a cultural turn toward skepticism, we are tempted to make allies of the skeptics, partly to distance ourselves from the religious right and partly to lay claim to credibility in a milieu in which it is okay to be spiritual but not to be religious. A consequence is that we find ourselves playing in the shallow end of the pool. The historic Protestant principle serves as an enabler when it privileges questioning...