As man dies only once and then rises, and is circumcised only once, therefore baptism is performed only once: it is not to be repeated because the baptised does not die with Christ more than once.
As for the relation between circumcision and baptism and the forgiveness of sins, the Apostle expresses it in his discourse about the spiritual circumcision; circumcision made by Christ and not by the hands of men; circumcision in which the old sinful body is taken off. He refers to baptism when he says: "In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ. And you, being dead in your trespasses and the uncircumcision of your flesh, He has made alive together with Him, having forgiven you all trespasses" (Col.2: 11,13).