Water baptism, though important, does not wash away your sins. Only the blood of Jesus shed on the cross can cleanse your soul.
Put your trust in his finished work, not in a work that you do.
Don’t sin. If you do, which we all will fall, repent and ask the Father God for forgiveness in the precious Holy name of Jesus! No mediator required. We arent doing sacrifices anymore. That was so yesterday in the Old Testament.
Do you know that until around 1943, Catholic Bibles commonly translated "repent" as "do penance"? Catholics on the thread will naturally pushback on this acknowledgement, but it is a verifiable fact.
When Jesus and John the Baptist said, "Repent" (Matthew 3:2; 4:17), the Latin