baptism [Gr., =dipping], in most Christian churches a sacrament. It is a rite of purification by water, a ceremony invoking the grace of God to regenerate the person, free him or her from sin, and make that person a part of the church. Thus, baptism is usually required for membership in the church. In Roman Catholic and Anglican theology baptism is also held to confer an indelible character on the person, requiring him or her to worship. Formal baptism is performed by immersion (as among the Baptists) or by pouring or sprinkling water on the person to be baptized. This ceremony is accompanied, in churches that accept the dogma of the Trinity, by a formula asking the blessing of Father, Son, and Holy Spirit. In some churches the child is baptized soon after birth and has sponsors (godfather and godmother) who make declarations of faith in his name. The rite is sometimes called christening, and this term is applied especially to the giving of a baptismal name. Other churches withhold baptism until the person is relatively mature. Some Protestant groups, such as the Religious Society of Friends, reject all outward baptismal rites. Similar customs are known in many non-Christian cultures. The baptism of Jesus himself can be considered part of the founding of the Christian Church.

In Christianity, the sacrament of admission to the church, symbolized by the pouring or sprinkling of water on the head or by immersion in water. The ceremony is usually accompanied by the words “I baptize you in the name of the Father, and of the Son, and of the Holy Spirit.” Indeed, Christians believe that after his resurrection, Jesus appeared to his disciples and commanded them to baptize in the name of the Father, Son, and Holy Spirit. In the teaching of St. Paul, it signifies the wiping away of past sins and the rebirth of the individual into a new life. Judaism practiced ritual purification by immersion, and the Gospels report that John the Baptist baptized Jesus. Baptism was an important ritual in the early church by the 1st century, and infant baptism appeared by the 3rd century. Roman Catholic, Orthodox, and most Protestant churches practice infant baptism. The Anabaptist reformers insisted on adult baptism after a confession of faith; modern Baptists and the Disciples of Christ also practice adult baptism.

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