The 21st century’s great intellectual conflict seems to be coming into focus, and it is a battle between Reason, the logic-based truth of scientists and academics; and Faith, the popular notion that truth is as much what we believe as what we can prove. The battle could be seen as a conflict between East and West, but those lines are blurring daily. It could be perceived as a battle between Left and Right, with the American right now teeming with evangelical Christians, and the left with secular intellectuals, but that leaves out the complicating factors of what is shaping up to be a truly global debate. “It is a conflict between competing certainties: between followers of Faith, who know because they believe, and followers of Reason, who believe because they know.”