Answer: God forgives all our sins when we are baptized;
when we were dead in our sins, God made us alive with Christ in
baptism, (verses 11, 12 and 13).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
Ephesians 2:1, 4-5: "As for you,
you were dead in your transgressions and sins...But because of
His great love for us, God, Who is rich in mercy, made us alive
with Christ even when we were dead in transgressions--it is by
grace you have been saved."