PESHAWAR, Pakistan (Reuters) – A pair of suicide bombers blew themselves up outside a 130-year-old church in Pakistan after Sunday Mass, killing at least 78 people in the deadliest attack on Christians in the predominantly Muslim South Asian country. Violence has been on the rise in Pakistan in past months, undermining Prime Minister Nawaz Sharif’s efforts to tame the insurgency by launching peace talks with the Pakistani Taliban. An assault of this scale is certain to give ammunition to Sharif’s critics who are against his peace initiative and believe militants have to be tackled by tough military…