Baptism makes you a new person because it remits original sin, it is an action of God, not any person. If you take a bath you will actually be clean, there is an action and a result, it is the same with Baptism. You are no longer burdened with original sin but you can still sin because you are a human being. It is a Sacrament.
When one is confirmed, also an act of God, you receive an indelible mark on your soul and is also a Sacrament and one that you choose.
There is no Sacrament that makes you perfect, you are only perfected through Jesus Christ and only to the extent that you say “yes”, IOW you have to cooperate with the Grace you are given. God gave us free will and Jesus asks us
to take on his yoke and let him lead us and many, even those who believe, refuse. They see God’s way as a burden and believe that they know better.
It is their own conceit but they don’t see it as that. They are blinded by their own opinion and their own voices are louder than God’s. Many are not willfully sinning, they aren’t even aware of the error of their ways but, God willing, they will someday hear His voice again and realize how wrong they are.
A Brief Catechism for Adults - Lesson 20: The Sacrament of Baptism
Baptism and the Usus Antiquior (Catholic/Orthodox Caucus)
Justified by Baptism (fallout from the Beckwith conversion grows)
The Million-Dollar Infant Baptism
The Early Church Fathers on Baptism - Catholic/Orthodox Caucus
A Critique of a Critique (On Baptism by Immersion)
Catholics, Reformed Christian Churches sign document recognizing common baptism