Book excerpt: "The dogma of papal infallibility has become increasingly problematic for Roman Catholics, and it is a major point of division in Christian ecumenical dialogue - arguably the key issue separating Catholics and other Christians today. Mark Powell here contends that papal infallibility has inevitable shortcomings as a way to secure religious certainty. After introducing the doctrine, he illustrates those limitations in the life and writings of four prominent Catholic theologians: Henry Edward Cardinal Manning, John Henry Cardinal Newman, Avery Cardinal Dulles, and Hans Kung." --Book Jacket.