When a ruler marched his people to the waters of baptism, the work of Christianization had only begun. Christian kings could order their subjects to be baptized, married, and buried in Christian ceremonies. Churches could be built, and people could be required to attend services and belong to parishes, but the process of conversion was a gradual one.

How did missionaries and priests get masses of pagan and illiterate peoples to understand Christian ideals and teachings? They did so through preaching, assimilation, the ritual of penance, and the veneration of saints. Missionaries preached the basic teachings of Christianity. In monasteries and cathedrals, men—and a few women—wrote hymns, prayers, and stories about the lives of Christ and the saints. People heard these and slowly became familiar with Christian notions.

Deeply ingrained pagan customs and practices could not be stamped out by words alone, however, or even by royal edicts. Christian missionaries often pursued a policy of assimilation, easing the conversion of pagan men and women by stressing similarities between their customs and beliefs and those of Christianity. In the same way that classically trained scholars such as Jerome and Augustine blended Greco-Roman and Christian ideas, missionaries and converts mixed pagan ideas and practices with Christian ones.

The ritual of penance was also instrumental in teaching people Christian ideas. Christianity taught that certain actions and thoughts were sins, meaning that they were against God’s commands. Only by confessing these sins and asking forgiveness could a sinning believer be reconciled with God. Confession was initially a public ritual, but by the fifth century individual confession to a parish priest was more common. The person knelt before the priest, who questioned him or her about sins he or she might have committed. The priest then set a penance such as fasting or saying specific prayers to allow the person to atone for the sin. Penance gave new Christians a sense of expected behavior, encouraged the private examination of conscience, and offered relief from the burden of sinful deeds.

Most religious observances continued to be community matters, as they had been in the ancient world. People joined with family members, friends, and neighbors at their parish church to attend baptisms, weddings, and funerals presided over by a priest. The parish church often housed the relics of a saint, that is, bones, articles of clothing, or other objects associated with a person who had lived (or died) in a way that was spiritually heroic or noteworthy. This patron saint was understood to provide protection and assistance for those who came to worship, and the relics served as a link between the material world and the spiritual one.

Christians came to venerate the saints as powerful and holy. They prayed to saints or to the Virgin Mary to intercede with God, or they simply asked the saints to assist and bless them. The entire village participated in processions marking saints’ days or points in the agricultural year, often carrying images of saints or their relics around the houses and fields. The decision to become Christian was often made first by an emperor or king, but actual conversion was a local matter, by people who came to feel that the parish priest and the patron saint provided them with benefits in this world and the world to come.