The word “baptism” means to “plunge” or “immerse.” This plunging does something beyond description. It actually brings about a complete transformation of the person baptized. They are “born again.” Remember what Jesus said to the Pharisee Nicodemus: “No one can enter the kingdom of God without being born of water and Spirit” (Jn 3:5). Baptism is that new birth. And this is not simply some symbolic or inspiring statement. Jesus is not just speaking in an analogous way. He’s telling the truth! Baptism is an actual new birth by water and the Holy Spirit. The result of this new birth is that a new person emerges. The old person enters into the water of baptism and dies. Then the new person rises from those waters. For this reason, the ideal form of baptism is full immersion. The person is completely plunged into the water just as Jesus died and entered into the tomb. And then, just as Jesus rose from the tomb, so also the newly created Christian rises from the waters.
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When a child or an adult is to be baptized, he or she must have at least one godparent or sponsor (the terms are interchangeable). It is customary for children to have two godparents. When there are two, one must be male and the other female. Godparents must meet all of the following criteria, which are established by universal Church law and which do not vary from place to place. Godparents must:
(a) be Catholic
(b) have been baptized, confirmed and receive Communion
(c) be 16 or older (although there may be exceptions to this rule at the discretion of the bishop)
(d) must be living a life consistent with their own baptismal vows.
(e) if married, they must be married in the Catholic Church
This means that they must be practicing the faith, cannot be engaging in notorious sin, and cannot have taken public positions in opposition to Catholic faith or morals. The godparent/sponsor must obtain a letter or certificate from their own pastor which affirms that they meet the above requirements.
Baptism is not a private act. It is a public, official liturgy of the Church and welcomes someone into the Catholic Church. Therefore, the Church has the duty and obligation to require reasonable criteria for being a sponsor. The sponsor is to assist the parents and the child in living a Catholic life. In order to do so, the sponsor needs to provide good example of living that life. A person who is not Catholic, or who is not living in a way consistent with the faith, obviously cannot provide the example that is part of the task of being a godparent. The role of godparent is a role of service done in the name of the Church, and the person who is a sponsor should be capable of performing that service.