The effects of the character imprinted on the soul by Baptism are that we become members of the Church, subject to its laws, and capable of receiving the other sacraments.
By Baptism we become members of the Church and children of God. We are given the right to enter heaven, and to gain merits by our good works. We assume the obligation to act as lay apostles for the spread of the Faith.
Baptism imprints an indelible sign or character on the soul. This character marks us as Christians, and cannot be removed by anything, even mortal sin. This character prevents the sacrament from being repeated: we can be baptized only once. “For all you who have been baptized into Christ have put on Christ” (Galatians 3:27).