For Boston University's Stephen Prothero, all religions agree that there's "something rotten" with the human condition. But as soon as they start to diagnose the predicament, they go off in their own directions. In an encore edition of our popular 2010 series, World Religions 101, Prothero breaks down eight traditions into four questions: What is the problem that religion is trying to solve? What is the solution? How do we get there? And which exemplars should we use as guides? This week: Islam, what he calls 'the way of submission.'