When he was 15, Juan Marrero, now an Anabaptist pastor in Philadelphia, used a pair of boxing gloves to settle a dispute with a young man who attacked his aunt and broke her ribs. Hand-to-hand fighting isn’t how many Anabaptists interpret what it means to turn the other cheek. And yet, choosing to box — rather than wield guns or knives — created peace in Fair­hill, one of the city’s poorest neighborhoods.