What is Christianity? -- Jesus of Nazareth -- Jesus Christ and St. Paul -- The New Testament -- Christianity in the ancient world -- The birth of Christendom -- Heresy and the fathers, Trinity and the councils -- Monasticism -- St. Augustine -- Rome and Constantinople: the great schism and the establishment of Western and Eastern Christianity -- Trinity and the seed of Islam -- The Dark Ages -- Medieval Christianity -- Scholastic theology -- The Protestant Reformation -- The Counter-Reformation -- The Protestant enlightenment -- Protestantism comes to America -- The Great Awakening and the worldwide missionary movement -- The nineteenth century: Modernism, science, and the Bible -- The twentieth century: the challenge of three formidable problems -- The twenty-first century and beyond.