Matthew 18:18 Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
But you forgot the next verses.
Matthew 18:19 Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven. 20 For where two or three are gathered together in my name, there am I in the midst of them.
That verse tells us two things. First, the “church” is wherever “two or three are gathered in my name”. Second, the ability to “bind and loose” is also give to any “two or three who are gathered” in the name of Jesus.
Then you posted this.
Acts 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.
You do understand that it was Paul talking to the elders of Ephesus only. They were only the elders of that local church not an overall governing body.
First, the “church” is wherever “two or three are gathered in my name”
It doesn't follow that the authority of the Church is whenever two people decide on something. It only says that when a small group gathers in Christ's name, He is with them. Second, the ability to “bind and loose” is also give to any “two or three who are gathered” in the name of Jesus.
This is also nonsense because then what you and Metmom figure to bind or loos binds on me, and in heaven. And then whenever I and Natural Law decide on something that binds on you and Metmom and in Heaven. so now heaven is bound on whatever any two Christians decide. You made a clear gospel of the authority of the Church say nothing useful. Typical Protestant minimization of the Holy Scripture.
Paul talking to the elders of Ephesus only
Here you go again. First, "bishops" (plural) already suggests several cities. Second, every time anyone is saying anything in the Holy Scripture it is said to someone in particular. For example, the Sermon on the Mount is only talking to the few disciples that were there on that mount; the verse about the Scripture being God-breathed is only spoken to Timothy, etc. That way you can ignore the entire book. Congratulations.
Trust and love the Holy Scripture who God gave you for instruction and you, too, will become Catholic and come to the fullness of Catholic faith.