Spare me the shabby Calvinism.
Baptism washes all sins clean. Those who are Baptised and do not sin again before their death are taken immediately to Heaven by the loving will of God Himself.
Christ's blood washes us clean.
The RCC has taken the blood of Christ and encased it in a box. Likewise, it has taken baptism and wrapped it up in ribbons and bows.
The RCC then tells the world that it alone can distribute these earthly presents to the world.
And that is a lie.
Baptism and the Lord's Supper are spiritual gifts from God to His children. Both are signs and seals of the promise God made to His family, named before the foundation of the world, that He will love them, guide them, and redeem them for everlasting.
How can you be baptized and not sin again? Impossible. That’s why you need a Saviour, to save you from your sinful nature and its deeds. Baptism is not salvific. It is necessary after salvation, but it does not save you. Only Jesus does that.