His death counts as your death to me. The answer is that I see the revelation of the Gospel now. Its not a religious club. So I reply, If you say that His death was my death, God, then I am dead. I demonstrate to God and to the world that I believe I am dead with Christ by undergoing water baptism.
Confession occurs in many forms.
The way we live our lives confesses whether we believe the Gospel or not. If God said our old sinful lives are considered dead through Christ, and you believe it, then you are going to walk around saying that you are dead. If you believe you will confess it. Its like God saying, I paid for your ticket to glory. You reply, Where s the plane.