Christ said that we must be born again; born of water and the Spirit, to be saved. He commissioned His Apostles to Baptize in the name of the Father, and of the Son, and of the Holy Spirit. Each Sacrament is efficacious of what it signifies. The Baptismal Font represents the Tomb of Christ as the Womb of the Church. It is by which many sons and daughters are "born".
This Sacrament is the first of three Sacraments of Initiation - Baptism, Confirmation and Eucharist. Original sin is washed away. The person becomes a member of the Church. A new relationship is established with God.