A strange contrast exists in the status of the Christian Church in the past seventy years. On the one hand the Church has clearly lost some of the ground which once appeared to be safely within its possession. On the other hand it has become more widely spread geographically and, when all mankind is taken into consideration, more influential in shaping human affairs than ever before in its history. In a paper as brief as this must of necessity be, space can be had only for the sketching of the broad outlines of this paradox and for suggesting a reason for it. If details were to be given, a large volume would be required. Perhaps, however, we can hope to do enough to point out one of the most provocative and important set of movements in recent history.