1 John 1:10
If we say that we have not sinned, we make him a liar, and his word is not in us.
In order to have fellowship with God, we must not deny that we have committed acts of sin. If we deny that, we are calling God a liar, as He has stated over and over in His word that all have sinned. God does not require that we be perfect, but that we acknowledge, confess, and forsake all of our sin.