That’s a very good explanation.
So...If I’m a sinner, how do I get into this “remission of sins” state?
1 John 1:9 “If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.”
Baptism is a symbol or a picture of what has happened in the life of the person who, by faith, has believed in Jesus Christ and been saved by His grace. It's an outward testimony by which the new Christian gives a public testimony that they have believed in Jesus Christ and have been born again. Being baptized by immersion the believer visually shows the spiritual death, burial, and resurrection of the believer's life. It is not an act that one does to obtain salvation and no one in the New Testament was baptized who did not first believe and put their faith in Jesus Christ. It is a public testimony of salvation.
Baptism in the New Testament always follows salvation by grace through faith it is not part of the causation of salvation or forgiveness.