Answer: God forgives us all our sins when we are made alive with Christ by being buried in baptism, and then raised to a new life with Him, (verses 12 and 13).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
We are made alive with Christ in baptism:
Romans 6:1-4: "What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We died to sin; how can we live in it any longer? Or don't you know that all of us who were baptized into Christ Jesus were baptized into His death? We were therefore buried with Him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life."
