The Shrine of Divine Mercy in downtown Salem received a relic of St. John Paul II’s blood yesterday during a dedication ceremony by Cardinal Sean P. O’Malley of the Archdiocese of Boston.The relic will be permanently housed in the shrine’s upper church, which was dedicated to the late pope yesterday.O’Malley received the relic as a gift from the longtime priest assistant to John Paul II and Archbishop of Emeritus Cardinal Stanislaw Dziwisz of Krakow, Poland.