The importance of baptism is clear from Jesus instruction at the Great Commission: Jesus commanded, “Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you; and lo, I am with you always, to the close of the age.”
St. Peter makes this more clear as he writes, “For Christ also suffered for sins once, the righteous for the sake of the unrighteous, that he might lead you to God. Put to death in the flesh, he was brought to life in the spirit. In it he also went to preach to the spirits in prison (purgatory), who had once been disobedient while God patiently waited in the days of Noah during the building of the ark, in which a few persons, eight in all, were saved through water. THIS PREFIGURED BAPTISM, WHICH SAVES YOU NOW. It is not a removal of dirt from the body but an appeal to God for a clear conscience, through the resurrection of Jesus Christ (1 Peter 3 Vs 18-21)”.
“Repent and be baptized everyone of you, in the name of Jesus Christ for the forgiveness of sins; and you will receive the gift of the Holy Spirit. For the promise is made to you and your children and to all those far off, whomever the Lord our God will call.” (Acts 2:38,39)