The journal Dappled Things offers a very interesting essay about Flannery O'Connor's influence on Bruce Springsteen. While along the way it namechecks U2 as another artist touched by her writing, the main interest is the thorough analysis of the artistic result of naming sin as sin, using it as "the starting point of understanding the human drama" (as, of course, U2 certainly do.) Check out "Naming Sin: Flannery O’Connor’s Mark on Bruce Springsteen."