Pope Benedict XVI waves to the crowd from the popemobile as he arrives for the celebration of the Eucharist at the Olympic stadium in Berlin, September 22, 2011. Pope Benedict urged the faithful not to leave the Roman Catholic Church on Thursday as he began a four-day visit to Germany, where record numbers have quit the pews in protest against clerical sex abuse of youths. REUTERS/Fabian Bimmer (GERMANY - Tags: POLITICS RELIGION)