(AP) — Louis Climis was a church youth leader, attending Mass at Our Lady of Salvation Church in Baghdad in October 2010 when six extremists stormed in and attacked worshippers. Dozens were killed in the massacre that changed Climis’ life forever. Still suffering from hearing loss 11 years later, he says the harrowing day planted the seeds of Christian mistrust of Muslims and prompted many Christians to flee the country. At the time it was deemed the bloodiest attack against Iraq’s Christians in seven years of sectarian warfare that followed the 2003 U.S. invasion. Some now hope that Pope Francis’ planned visit will help encourage Christians to return, over a decade since the massacre.