I don't care about your reasoning. I have a clear scripture that explains the authority of the Church. Rather than reasoning around it, you have an obligation as a Christian to obey it, even more so if you claim, as a Protestant, to go by scripture alone.
Scripture says things. It is clear. The Kingdom of God is within each individual, giving them the authority, each one, to take their salvation therefrom.
The church, like any other organization, can only get the authority that its members can consent to give it. It has no authority beyond that. The scriptures are clear, and reasoning from the scriptures is compelling.
You only make your argument because you are invested in the church and have chosen to depend on it for your salvation. As such, it is your salvation, because your choice gives it that power, over you, and no one else.
Scripture, the teaching of Jesus and the apostles, clearly gives each individual the means, exclusively, to their salvation through faith and belief. No church is needed, therefore no church can have the authority you claim; it has been otherwise assigned. Every passage of scripture bears witness to that either explicitly or implicitly.
The statement of Jesus, saying the the Kingdom of God is within, alone, with no other scripture, assigns that authority to the individual and no church pronouncements otherwise can prevail against it.