"I would not DARE consider my own church as the final authority over Christendom "
Then leave it.
One race, Humanity.
One religion, Love.
You quoted right on the edge of your own answer.
Ephesians 5
25Husbands, love your wives, just as Christ also loved the church and gave Himself up for her,
26so that He might sanctify her, having cleansed her by the washing of water with the word,
27that He might present to Himself the church in all her glory, having no spot or wrinkle or any such thing; but that she would be holy and blameless.
28So husbands ought also to love their own wives as their own bodies. He who loves his own wife loves himself;
29for no one ever hated his own flesh, but nourishes and cherishes it, just as Christ also
does the church,
30because we are members of His body.
31FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER AND SHALL BE JOINED TO HIS WIFE, AND THE TWO SHALL BECOME ONE FLESH.
32This mystery is great; but I am speaking with reference to Christ and the church.
The Church is Jesus Christ. It is ONE FLESH. Jesus Christ is its head.
What ever Jesus commands, the Church has spoken.
The church is also God breathed:
22And when He had said this, He breathed on them and said to them, “Receive the Holy Spirit.
23“If you forgive the sins of any,
their sins have been forgiven them; if you retain the
sins of any, they have been retained.”
Given direct authority to forgive and retain sins.
If Jesus Christ was not the head of my church, not one flesh, I'd be gone in the heartbeat, church-less.
Its not my place to start a new club then try to live up to the ideal of what I guess how his church would behave.
He personally started a church it is a living church and in his prayer he prayed that it would never disappear from earth. That his church is divinely guarded. He also prayed for unity.
John 17
13“But now I come to You; and these things I speak in the world so that they may have My joy made full in themselves.
14“I have given them Your word; and the world has hated them, because they are not of the world, even as I am not of the world.
15“I do not ask You to take them out of the world, but to keep them from the evil
one. 16“They are not of the world, even as I am not of the world.
17“Sanctify them in the truth; Your word is truth.
18“As You sent Me into the world, I also have sent them into the world.
19“For their sakes I sanctify Myself, that they themselves also may be sanctified in truth.
20“I do not ask on behalf of these alone, but for those also who believe in Me through their word;
21that they may all be one; even as You, Father,
are in Me and I in You, that they also may be in Us, so that the world may believe that You sent Me.