ISLAM has overtaken Roman Catholicism as the biggest single religious denomination in the world. Monsignor Vittorio Formenti, who compiled the Vatican's 2008 yearbook, said Muslims made up 19.2 per cent of the world's population and Catholics 17.4 per cent. "For the first time in history we are no longer at the top - the Muslims have overtaken us," Monsignor Formenti told Vatican newspaper L'Osservatore Romano, saying the data referred to 2006. He said that if all Christian groups were considered, including Orthodox churches, Anglicans and Protestants, then Christians made up 33 per cent of the world's population - or about...