TEXT: "In this March 5, photo, Pope Francis is presented by a girl with a drawing while touring St. Peter's Square at the Vatican prior to the start of his weekly general audience. Pope Francis insists his weekend pilgrimage to the Middle East is a ""strictly religious"" commemoration of a key turning point in Catholic-Orthodox relations. But the three-day mission is the most delicate of his papacy and will test his diplomatic chops as he negotiates Israeli-Palestinian tensions and fallout from Syria's civil war."