Ralph Keen is associate professor of religious studies at the University of Iowa. Professor Keen received his doctorate in the history of Christianity from the University of Chicago.

• Part 1 The Emergence of ChristianityChapter 2 Judaism in Various Forms: An Ambivalent InheritanceChapter 3 Literature of the Early Church: Texts as Preservers of ExperienceChapter 4 Roman Power and Religion: Divine Destinies in ConflictChapter 5 Worship in the Early Church: A Case Study in AdaptationPart 6 The Christian Religion in Late AntiquityChapter 7 The Emergence of Hierarchy: Papal BeginningsChapter 8 The Flourishing of Liturgy: Devotion Through Ritual and ImageryChapter 9 The Monastic Microcosm: The Benedictine Norm and ReformChapter 10 The Expansion of the Church: First Missionary Movements and the CrusadesPart 11 Medieval Western Christian CultureChapter 12 Carolingian Culture and Religion: A Medieval RenaissanceChapter 13 Scholasticism: From Anselm to AquinasChapter 14 The Church and the Law: The Investiture ControversyChapter 15 The Mendicant Orders and Lay Movements: New Forms of Religious LifeChapter 16 Scholasticism and Salvation: The Sacramental SystemChapter 17 Spirituality and Mystical Experience: Medieval MysticsPart 18 From Medieval to Modern, from One Church, ManyChapter 19 Launching the Reformation: Martin Luther's RevolutionChapter 20 Development of the Reformation: The Spread of ProtestantismChapter 21 Protestant Orthodoxy: Developments in ScholasticismChapter 22 Reformation-Era Catholicism: Reaction and New Religious OrdersChapter 23 The Challenge of Rationalism: Skepticism and Faith in the 17th CenturyChapter 24 Early American Religion: Between Reformation and EnlightenmentPart 25 From Enlightenment to ModernityChapter 26 Enlightenment Religion: Adaptations in an Age of ProgressChapter 27 The Dawn of Modern Religion: The West and its MissionsChapter 28 Challenges to the English Church: The Oxford Movement and EvolutionChapter 29 Nineteenth-century America: Religious Diversity and RevivalismChapter 30 Roman Catholicism: Confronting the Modern WorldPart 31 The Twentieth Century and BeyondChapter 32 Social Christianity: The Dawn of the 20th CenturyChapter 33 The Crisis of War: The Recovery of OrthodoxyChapter 34 Ecumenical Initiatives: The World Council of Churches and Vatican IIChapter 35 Mainstreams and Margins: Colonialism and Liberation TheologyChapter 36 Christianity at the Dawn of the Third Millennium