"Barth has been variously damned as a heretic, a narrow-minded Biblicist, and an atheist in disguise — and praised as the most creative Protestant theologian since John Calvin. President James McCord of Princeton Theological says that "he bestrides the theological world like a colossus." Harvard's German-born Paul Tillich, the contemporary religious thinker whose stature most nearly rivals Barth's, has often disagreed with Barth — : "shouting at each other over a glass of wine" — but calls him, "the most monumental appearance in our period." Roman Catholic theologians, notably in Europe, have praised his thinking in terms they usually reserve for St. Thomas Aquinas. Once, upon hearing that Pius XII had paid tribute to his work, Barth smiled and said, "This proves the infallibility of the Pope." More seriously, he insists that the best critical work on his works — over 500 titles so far — has been done by such Catholic Modernists as French Jesuit Henri Bouillard and Father Hans Urs von Balthasar of Basel. By contrast, Reinhold Niebuhr regards Barth as a "man of infinite imagination and irresponsibility" writing "irrelevant theology to America. I don't read Barth any more," he says. And Dr. Cornelius Van Til of Westminster Theological Seminary speaks for a host of U.S. fundamentalists in charging that "Barthianism is even more hostile to the theology of Luther and Calvin than Romanism."