In him you were also circumcised, in the putting off of the sinful nature, not with a circumcision done by the hands of men but with the circumcision done by Christ, having been buried with him in baptism and raised with him through your faith in the power of God, who raised him from the dead. Col 2:11-12
The word buried in Greek is sunthapto it means to enter into company with, to assimilate spiritually(to Christ by a sepulture-burial place- as to sin). Risen with is sunegeiro it is the idea of collecting one's faculties, to waken from sleep, disease or death.
According to the book of Romans we are all sinners, 3:23 and dead in our sin, 5:12, 6:23. For the believer, this means we were buried with Christ and risen with him. Our sins stayed in the grave, defeated by Christ's life and death.
It is not the act of baptism that saves us, for we know of those who are born again and have not yet been baptized; and we know many that have been baptized and live no life that glorifies God, perhaps even having renounced him.
It is the spiritual rebirth, accomplished by that great power of God that renews the dead.
Dead men have no faith.
It comes from the creator.
Do we still sin? unfortunately yes. but it is that power that defeated sin and Satan that dwells within the Christian. This enables us to engage in the battle. The battle between the old self, called the flesh, the worldly selfish desire to please our every whim; and the new self, renewed in our minds, created to be like God.
It is that great power that left our sins in the grave. If Christ is not your savior, the Lord of your life, those sins are still with you. Those sins will be judged. Are you ready?