By Karl-Josef Kuschel. Crossroad, 664 pp., $39.95.

HANS KUNG ends his foreword to this book by declaring: "It is a book which I would like to have written myself" In fact, the book bears all the trademarks of a Kung book--big, bold and bombastic. Its author, Karl-Josef Kuschel, teaches at the Institute for Ecumenical Research of the University of Tubingen, which he calls his spiritual home and to which he dedicates this book. The Catholic Theological Faculty of Tubingen ...