Garry Wills Discusses Leadership.

In a new book about the constitutional separation of church and state, Pulitzer Prize-winning historian Garry Wills insists that that separation was meant as "the great protector of religion, not its enemy." That, as Wills tells guest host Dave Davies, hasn't stopped fervent believers from challenging the concept.

Wills, a translator of St. Augustine and author of What Jesus Meant, is an emeritus professor of history at Northwestern University; the new book is titled Head and Heart: American Christianities.

Author Garry Wills. The Pulitzer Prize winner has written a new book criticizing the Catholic Church. It’s called “Papal Sin: Structures of Deceit.” (Doubleday) Wills is a practicing Catholic and studied with Jesuit priests, though he was never ordained. In Papal Sin, Wills describes a papacy that seems unable or unwilling to admit its mistakes. He writes, “Given so much to hide, the impulse to keep hiding becomes imperative, automatic, almost inescapable.” He addresses topics such as birth control, the ordination of women, and views on the Holocaust.

Pulitzer-Prize winning writer Garry Wills. His new book is "A Necessary Evil: A History of American Distrust of Government" (Simon & Schuster). Wills is also the author of "Lincoln At Gettysburg: The Words That Remade America." And he's written other books on Nixon, Reagan and Kennedy, as well as a look at the relationship between politics and popular culture via celebrity, "John Wayne's America: the Politics of Celebrity."