Religious leaders often denounce violence. But radicals also use religion to rally support for violence. So does religion cause violence? And if so, is secularism the answer? Ross Reynolds talks it over with James Wellman, professor and chair of the religion program at University of Washington’s Jackson School of International Studies and the author of "Belief and Bloodshed: Religion and Violence Across Time and Tradition," and Rachel Woodlock, author of "For God’s Sake: An Atheist, A Jew, A Christian and A Muslim Debate Religion."