The U.S. may have the most Christians of any nation in the world, but a new poll from the Pew Research Center shows a decline in their numbers and a jump in Americans who identify as having no religion at all -- a change that Pew calls "astounding." The Pew study polled 35,000 people, and found more Americans -- especially millennials -- classified as atheist, agnostic or "nothing in particular." We discuss America's changing religious landscape, and how it's been affected by ethnic diversity, religious intermarriage and non-Christian faiths.
Number of Christians in U.S. Declines Sharply
Greg Smith, associate director of research for the Pew Research Center and co-author of "America's Changing Religious Landscape"