Oh boy! that's a peach! You admit the absolute authority of Scripture in the very post in which you deny it!He has shown you the higher authority here on earth,you just refuse to accept that. The Scriptures clearly tell us of the institution of His Holy Church as the vehicle for the teaching of the faithful; it clearly states that the leaders of that Church would have the power to "bind and loose" things here on earth that would also be bound in heaven. Don't believe me, just look at the historical record of the One Universal Christian Church. Jesus never said that a book should be written and the faithful should figure out things by themselves - this idea is alien to the Christian experience.
Where do we learn that the leaders of churches have the power to bind and loose things on earth? In Scripture, as you so rightly tell us. If it were not in Scripture you would not be able to claim it. But there it is in Matthew 18:18, which is, in case you are in any doubt, Scripture. So it is Scripture that gives authority to the churches and their leaders, which makes it the sole authority under Christ. If there's no Scripture, there's no doctrine and no churches..