It doesn't, nor did I claim that it does. But you are claiming that whoever believes in the Lord Jesus and confess with his mouth is a true believer and belongs to "His Church" (see #242). So you are using a conception of the Church as only an "invisible Church", i.e. the "set of all believers". That notion of the Church is entirely foreign to the fathers. According to your position, excommunication does not *do* anything to the person being excommunicated, since as long as he "confesses Jesus as Lord and believes in his heart", he is still saved, whether or not He is in the visible Church. Your notion that the Church is only invisible fails to recognize the significance of the keys given to Peter such that whever he bound on earth would be bound in heaven (Matt 16:18-19), and that if the Apostles (and the bishops that succeeded them) forgave the sins of any, they are given, but if they retained the sins of any, there were retained (John 20:23).
-A8
What do you think that “confess with your mouth the Lord Jesus” means?