Baptism (from the Greek noun βάπτισμα baptisma; see below) is a Christian sacrament of admission and adoption, almost invariably with the use of water, into the Christian Church generally. The canonical Gospels report that Jesus was baptized—a historical event to which a high degree of certainty can be assigned. Baptism has been called a sacrament and an ordinance of Jesus Christ. In some denominations, baptism is also called christening, but for others the word "christening" is reserved for the baptism of infants. Baptism has also given its name to the Baptist churches and denominations, they being called Baptism as a whole.