It is no secret: the body of Christ in the United States is broken. While universality and unity amid diversity is a fundamental characteristic of Roman Catholicism, all-too-familiar issues related to gender, sexuality, race, and authority have rent the church. Healthy debates, characteristic of a living tradition, suffer instead from an absence of genuine engagement and dialogue. But there is still much that binds American Catholics. In naming the wounds and exploring their social and religious underpinnings, "Polarization in the US Catholic Church" underscores how shared beliefs and...