From the Cetchism of the Catholic Church
BAPTISM: The first of the seven sacraments, and the “door” which gives access to the other sacraments. Baptism is the first and chief sacrament of forgiveness of sins because it unites us with Christ, who died for our sins and rose for our justification. Baptism, Confirmation, and Eucharist constitute the “sacraments of initiation” by which a believer receives the remission of original and personal sin, begins a new life in Christ and the Holy Spirit, and is incorporated into the Church, the Body of Christ. The rite of Baptism consists in immersing the candidate in water, or pouring water on the head, while pronouncing the invocation of the Most Holy Trinity: the Father, the Son, and the Holy Spirit (977, 1213 ff.; 1275, 1278).
I am only guessing here and it is possible that I am wrong, but if our nature is sinful and that is all it is and was not caused by something, then what exactly does Baptism remit?
The inclination to sin? Nope it’s still there
Sniful Nature? Nope that’s still there.
Anything else?
If original sin is not removed then what is the purpose of Baptism?