No. 1 BAPTISM
When we’re born, we all have something called original sin. It was the one first committed by Adam and Eve. When baptized, we are washed of that sin and of all those committed before receiving it. We’re made sons and daughters of God and we officially become a part of the Church.
God is very happy when the priest, while pouring holy water on the baptized one, says “I now baptize you in the name of the Father and of the Son and of the Holy Spirit.”