The church became a powerful institution within the Empire. The Christian doctrines appealed to those who despaired of this world. They also attracted many strong men who found it impossible to make a career under the Imperial government, but who could exercise their gifts of leadership among the humble followers of the Nazarene teacher. At last the state was obliged to take notice. The Roman Empire (I have said this before) was tolerant through indifference. It allowed everybody to seek salvation after his or her own fashion. But it insisted that the different sects keep the peace among themselves and obey the wise rule of "live and let live."
The Christian communities however, refused to practise any sort of tolerance. They publicly declared that their God, and their God alone, was the true ruler of Heaven and Earth, and that all other gods were impostors. This seemed unfair to the other sects and the police discouraged such utterances. The Christians persisted.
Soon there were further difficulties. The Christians refused to go through the formalities of paying homage to the emperor. They refused to appear when they were called upon to join the army. The Roman magistrates threatened to punish them. The Christians answered that this miserable world was only the ante-room to a very pleasant Heaven and that they were more than willing to suffer death for their principles. The Romans, puzzled by such conduct, sometimes killed the offenders, but more often they did not. There was a certain amount of lynching during the earliest years of the church, but this was the work of that part of the mob which accused their meek Christian neighbours of every conceivable crime, (such as slaughtering and eating babies, bringing about sickness and pestilence, betraying the country in times of danger) because it was a harmless sport and devoid of danger, as the Christians refused to fight back.
Meanwhile, Rome continued to be invaded by the Barbarians and when her armies failed, Christian missionaries went forth to preach their gospel of peace to the wild Teutons. They were strong men without fear of death. They spoke a language which left no doubt as to the future of unrepentant sinners. The Teutons were deeply impressed. They still had a deep respect for the wisdom of the ancient city of Rome. Those men were Romans. They probably spoke the truth. Soon the Christian missionary became a power in the savage regions of the Teutons and the Franks. Half a dozen missionaries were as valuable as a whole regiment of soldiers. The Emperors began to understand that the Christian might be of great use to them. In some of the provinces they were given equal rights with those who remained faithful to the old gods. The great change however came during the last half of the fourth century.