It is Easter morning and members of Del Muerto Presbyterian Church assemble around a roaring fire. They gather close to the edge of Canyon de Chelly in northeastern Arizona — an ancient home of the Anasazi Indians and a historic hideout for Navajos resisting Spanish and American invaders. The morning gathering is the culmination of “SingSpiration,” the congregation’s three-day tent revival, which has been so successful that they ran out of mutton stew at Saturday’s lunch.