Includes bibliographical references.

Second-century critic Celsus queries Polycarp, Valentinus, and Montanus about the Christian sect -- Second-century critic Celsus interviews Tertullian, Irenaeus, and Clement about Christianity -- Second- and third-century leaders Irenaeus, Tertullian, and Clement discuss beliefs necessary to be a true Christian -- Second- and third-century Origen and Tertullian debate faith's relationship to reason and the nature of the eternal Godhead -- Third-century Bishop Cyprian of Carthage is interviewed about the church and salvation -- Fourth-century Alexandrians deacon Athanasius and presbyter Arius are interviewed about the Council of Nicaea -- The fourth-century Cappadocian fathers meet to settle on the Orthodox doctrine of the Trinity -- Prominent fifth-century thinkers Cyril, Apollinaris, Nestorius, and Eutyches discuss the humanity and divinity of Jesus Christ -- Fifth-century Bishop Augustine of Hippo and British monk Pelagius argue about sin and salvation -- Medieval abbot-archbishop Anselm of Canterbury and monk-philosopher Abelard debate faith, reason, and atonement --

Medieval scholastic philosopher-theologian Thomas Aquinas and tree-hugger Francis of Assisi enthuse on how to know God -- Sixteenth-century Bucer convenes Luther, Karlstadt, Erasmus, Zwingli, Grebel, Calvin, and Servetus on church reform -- Reformer Luther and Roman Catholic theologian Eck dispute the nature of salvation, grace, faith, and justification -- Reformers Luther, Hubmaier, Zwingli, and Calvin debate the Lord's Supper and baptism -- Sixteenth-century reformer Calvin and seventeenth-century theologian Arminius contest divergent views of salvation -- Eighteenth-century evangelical revivalists-theologians Wesley and Edwards compare differing views of salvation -- Eighteenth-century Irish deist Toland and English evangelist Wesley debate faith and reason, God and miracles -- Enlightenment philosophers Locke, Kant, and Hegel deal with issues impinging on Christian theology -- Father of modern theology Schleiermacher and philosophers Kant and Hegel debate the essence of religion and Christianity --

Theologians liberal Rauschenbusch and conservative Machen argue about true Christianity, the Bible, evolution, and doctrine -- Twentieth-century Barth and Brunner discuss theological method with nineteenth-century liberal Schleiermacher -- Barth and Brunner contest their differences on natural theology and whether all will be saved -- Twentieth-century theological giants Barth and Tillich discuss crucial issues, Christ and culture -- Twentieth-century ethicists Rauschenbusch, Niebuhr, Gutiérrez, Yoder, and Olasky dispute the meaning of justice -- Twentieth-century theologians Bultmann and Pannenberg debate faith, myth, and Jesus's resurrection -- Twentieth-century theologians Henry and Ramm dispute about evangelical theology, modernity, and the Enlightenment -- Twentieth-century Roman Catholic theologian Rahner is interviewed about his controversial but influential theories -- Three liberation theologians debate about humanity's worst oppression and how liberation should happen -- Two postmodern theologians discuss the meaning of theology in postmodern culture.