Reviewed by Alban McCoyTHE CATHOLIC UNIVERSITY OF AMERICA PRESS, 110pp, £10.25Tablet bookshop price £9.25              Tel 01420 592974Fifty years ago, on the shore of the Sea of Galilee, Pope Paul VI met Athenagoras, the Patriarch of Constantinople. No one knew what would happen. No wonder. There had been no encounter like it since 1054, when Eastern and Western Christianity, for complex reasons, had gone their separate ways. The result was to be the lifting of the mutual excommunication that had been in place for almost 1,000 years and the beginning of a dialogue aimed at reuniting what Pope John Paul II described as “the two lungs of the Church”. Intensive discussions have been taking place ever s