According to the Apostle Paul, the believer enters through Baptism into communion with Christ's death, is buried with Him, and rises with Him:
"Do you know that all of us who have been baptized into Christ Jesus were baptzed into his death? We were buried therefore with him by baptism into death, so that as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life" (Romans 6:3-3; cf. Colossians 2:12).
The baptized have "put on Christ" (Gal 3:27). Through the Holy Spirit, Baptism is a bath that purifies, justifies, and sanctifies (1 Cor 6:11; 12:13).
- Catechism of the Catholic Church, no. 1227
Baptism is the first of the three Sacraments of Initiation; the other two are Confirmation and Eucharist. In the waters of Baptism, we become members of the Body of Christ--God's People; we are configured to Jesus Christ the High Priest and share in his prophetic, kingly, and priestly mission; original sin is remitted.