From John Stossel's blog: I don't know if God exists. I'd like to believe, but... In this week's show, atheists and believers weigh in on some life's most important questions: How was life created? Why is there order in the universe? Does science eliminate the need for God? Lawrence Krauss and Michael Shermer say that humans invent religion to explain what they don't understand. But Ian Hutchinson and Dinesh D'Souza disagree--they're Christians who say their beliefs help make sense of what we know from science. Bill Nye "The Science Guy" argues that creationism should not be taught to children. Nidhal Guessoum, a professor of astrophysics in the United Arab Emirates, explains why Muslims have a particularly difficult time accepting modern science. And what would a world without God look like? Larry Taunton, author of "The Grace Effect," says that the 20th century was an experiment in secular governance--and resulted in the deaths of millions of people.