The results of Peter's preaching on the day of Pentecost were such as to decide the future policies, and to determine the plans, of the majority of the apostles in their efforts to proclaim the gospel of the kingdom. Peter was the real founder of the Christian church; Paul carried the Christian message to the gentiles, and the Greek believers carried it to the whole Roman Empire.

Although the tradition-bound and priest-ridden Hebrews, as a people, refused to accept either Jesus' gospel of the fatherhood of God and the brotherhood of man or Peter's and Paul's proclamation of the resurrection and ascension of Christ (subsequent Christianity), the rest of the Roman Empire was found to be receptive to the evolving Christian teachings. Western civilization was at this time intellectual, war weary, and thoroughly skeptical of all existing religions and universe philosophies. The peoples of the Western world, the beneficiaries of Greek culture, had a revered tradition of a great past. They could contemplate the inheritance of great accomplishments in philosophy, art, literature, and political progress. But with all these achievements they had no soul-satisfying religion. Their spiritual longings remained unsatisfied.

Upon such a stage of human society the teachings of Jesus, embraced in the Christian message, were suddenly thrust. A new order of living was thus presented to the hungry hearts of these Western peoples. This situation meant immediate conflict between the older religious practices and the new Christianized version of Jesus' message to the world. Such a conflict must result in either decided victory for the new or for the old or in some degree of compromise. History shows that the struggle ended in compromise. Christianity presumed to embrace too much for any one people to assimilate in one or two generations. It was not a simple spiritual appeal, such as Jesus had presented to the souls of men; it early struck a decided attitude on religious rituals, education, magic, medicine, art, literature, law, government, morals, sex regulation, polygamy, and, in limited degree, even slavery. Christianity came not merely as a new religion—something all the Roman Empire and all the Orient were waiting for—but as a new order of human society. And as such a pretension it quickly precipitated the social-moral clash of the ages. The ideals of Jesus, as they were reinterpreted by Greek philosophy and socialized in Christianity, now boldly challenged the traditions of the human race embodied in the ethics, morality, and religions of Western civilization.

At first, Christianity won as converts only the lower social and economic strata. But by the beginning of the second century the very best of Greco-Roman culture was increasingly turning to this new order of Christian belief, this new concept of the purpose of living and the goal of existence.