All human beings, as descendants of Adam, we all carry the stain of original sin at our birth, as Saint Paul tells us, “as sin came into the world through one man and death through sin, and so death spread to all men because all men sinned.” (Romans 5:12)
It is therefore that, through baptism, we die to a life of sin and are resurrected in Christ to a new life, as children of God (CCC 1213) and heirs of the Kingdom of Heaven.
The baptism of our Lord in the Jordan by Saint John the Baptist was necessary, not because of His sins, because He did not have them, but because he made it possible for the material of baptism, water, to be made worthy of being able to cleanse our sins through said sacrament.
Just as Jesus Christ begins his ministry after his baptism (Matthew 3:13), with our baptism we begin the reception of the sacraments and our Christian life, we begin to form the body of Christ and we become more united to Him when we receive the sacrament of confirmation and communion.
The Lord himself affirms that Baptism is necessary for salvation (John 3:5). He also commands his disciples to proclaim the Gospel to all nations and to baptize them (Matthew 28:19-20). Baptism is necessary for salvation for those to whom the Gospel has been proclaimed and who have had the possibility of asking for this sacrament (Mark 16:16). The Church does not know of any means other than Baptism that assures entry into eternal beatitude; this is why she takes care not to neglect the mission she has received from the Lord to see that all who can be baptized are “reborn of water and the Spirit.” God has bound salvation to the sacrament of Baptism (CCC 1257)
Let us always remember and evoke our baptismal promises, renounce sin and embrace Jesus Christ as our Lord and Savior.