Awhile ago I did a post on why do we as Christians feel the need to ask God to forgive us of our sins.
I still am so amazed that God has removed my sin, all of it, and He doesn't even see it! Yahoo! So because it is a finished work there is no need to feel guilty and plead for forgiveness, or to have to wait to be forgiven or to fear God won't forgive you! It's done!
Anyway, I do believe that confessing our sin for our own benefit to God is a good idea, so we can again thank Him that He already had forgiven us and show our gratitude.
Today Steve McVey addressed this issue in his 101 lies series check it out here;