God in America: Soul of a Nation (5) and Of God and Caesar (6): "Soul of a Nation" explores the post-World War II era, when rising evangelist, Billy Graham, tried to inspire a religious revival that fused faith with patriotism in a Cold War battle with "Godless Communism." As Americans flocked in record numbers to houses of worship, non-believers and religious minorities appealed to the U.S. Supreme Court to test the constitutionality of religious expression in public schools. Civil rights leader Martin Luther King Jr. emerged as a modern-day prophet calling upon the nation to honor both biblical teachings and the founders' democratic ideals of equal justice. "Of God and Caesar" explores the religious and political aspirations of conservative evangelicals' moral crusade over divisive social issues such as abortion and gay marriage. Across America, the religious marketplace expanded as new waves of immigrants from Asia, the Middle East and Latin America made the United States the most religiously diverse nation. The 2008 presidential election brought the re-emergence of a religious voice in the Democratic Party, bringing the country to a new plateau in its struggle to reconcile faith with politics. The 6-hour series closes with reflections on the role of faith in the public life of the country.