My (fallen away catholic) daughter just had first child. When I asked her about baptism for the baby, response was had not even thought about it. when I tried to talk to her about the importance of it to cleanse the soul of original sin, she expressed how could a baby have sin. Jesus in scripture has referenced that to have eternal life an adult needed to like a child. Can someone help me frame a response to her?
Don’t explain it in terms of sin, but rather, explain it as the first step in sharing in God’s eternal life. After God created the heavens and the earth, the Spirit moved among the the waters, forming everything. In the same way, after being born, the Spirit moves among the waters of the baptismal font, beginning the formation of the child into a son or daughter of God. The old creation is made through water and the Spirit, and so the new birth is made through water and the Spirit.
Tell her that Christ was born of the Father as the Son of God and reborn of the Blessed Mother as the Son of Man, so that we sons of men born from our mothers can be reborn in the Spirit as sons of God. Just as the Sonship of Christ was announced at his baptism, so too is her child’s sonship announced at his own baptism.
Tell her that as sons of God, we share everything the Son of God inherits from His Father, and that just as circumcision entered one into the old covenant with God, baptism enters one into the new covenant with God.
You could try and explain what original sin is, and why it is not personal sin, but I think she might have some reservations about the common presentation of the doctrine, and so explaining baptism in terms of Divine adoption and rebirth would be more convincing, especially sin these are terms Christ himself explains baptism in as much as the absolution of sins.
If you do have to explain original sin, explain it in terms of exile: Adam and Eve were exiled from God’s grace, and what happens to children born from exiled parents? They too are born in exile. But the King in his mercy has sent servants (the Prophets), and eventually his very Son, to invite the children of Adam back into the Kingdom of God.
Christi pax.