So you are talking about Sacrament of Baptism.
It is through the sacrament of Baptism that we become Christians, “For by one Spirit we were all baptized into one body” (1 Corinthians 12:13). Baptism also takes away sin: “Rise and be baptized, and wash away your sins” (Acts 22:16). Baptism and Confirmation are the sacramental elements of being born again, and the normal means by which we receive the Holy Spirit. Jesus tells us in John 3:5, “Unless one is born of water and spirit, he cannot enter the Kingdom of God.” And in Acts 2:38-39, Peter says, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins, and you shall receive the gift of the Holy Spirit. For the promise is to you and to your children and to all that are far off, everyone whom the Lord our God calls to Him.”
No it isn't. It's through faith in Christ, by believing in His name according to Him in John 3 when He's talking to Nicodemus.
Physical rituals don't cause spiritual realities to happen.