BETHLEHEM, WEST BANK - MAY 25:  Palestinian security forces stand guard as Pope Francis (not seen) leads an open-air mass at the Manger Square, outside the Church of the Nativity in the West Bank town of Bethlehem, on May 25, 2014. Pope Francis on Sunday arrived in the central West Bank city of Bethlehem on his first visit to the holy city since assuming the papacy in March of last year. (Photo by Salih Zeki Fazlioglu/Anadolu Agency/Getty Images)