In recent years it has become customary to base discussions of the origin of Christianity upon the apostle Paul. Jesus Himself, the author of the Christian movement, wrote nothing--at least no writings of His have been preserved. The record of His words and deeds is the work of others, and the date and authorship and historical value of the documents in which that record is contained are the subject of persistent debate. With regard to the genuineness of the principal epistles of Paul, on the other hand, and with regard to the value of at least part of the outline of his life which is contained in the Book of Acts, all serious historians are agreed. The testimony of Paul, therefore, forms a fixed starting-point in all controversy. Obviously that testimony has an important bearing upon the question of the origin of Christianity. Paul was a contemporary of Jesus. He attached himself to Jesus' disciples only a very few years after Jesus' death; according to his own words, in one of the universally accepted epistles, he came into early contact with the leader among Jesus' associates; throughout his life he was deeply interested (for one reason or another) in the affairs of the primitive Jerusalem Church; both before his conversion and after it he must have had abundant opportunity for acquainting himself with the facts about Jesus' life and death. His testimony is not, however, limited to what he says in detail about the words and deeds of the Founder of the Christian movement. More important still is the testimony of his experience as a whole. The religion of Paul is a fact which stands in the full light of history. How is it to be explained? What were its presuppositions? Upon what sort of Jesus was it founded? These questions lead into the very heart of the historical problem. Explain the origin of the religion of Paul, and you have solved the problem of the origin of Christianity.