Marty Moss-Coane was joined today on "Radio Times" by Tony Campolo and his son Bart. Tony is a prominent long-time pastor, and his son gave up Christianity at 50 years old. Bart describes himself as a "secular humanist" because "I don't want to be defined by what I don't believe."

At the top of the show, the two proved how people can disagree, yet respect each other's views and continue a loving relationship.

Bart and Tony's example proves that whether your differences are religious, political, or personal, an attitude of mutual respect is attainable and more productive than competitiveness.

Bart and Tony Campolo's new book is called "Why I Left, Why I Stayed: Conversations on Christianity Between an Evangelical Father and His Humanist Son."

The two are the subject of a forthcoming documentary film, "Far From the Tree."

Listen to Friday's full hour of Radio Times.