PESHAWAR, Pakistan — A pair of suicide bombers blew themselves up amid hundreds of worshippers at a historic church in northwestern Pakistan on Sunday, killing 78 people in the deadliest-ever attack against the country's Christian minority. A wing of the Pakistani Taliban claimed responsibility for the bombing, raising new questions about the government's push to strike a peace deal with the militants to end a decade-long insurgency that has killed thousands of people. The Jundullah arm of the Taliban said they would continue to target non-Muslims until the United States stopped drone attacks in Pakistan's remote tribal region.