I can think of no answer that would evince greater fatuity than this one. It goes without saying it is utterly hypocritical to claim something has no "authoritative support" from the Scripture when one can not show from the Scripture how this "support" is gained or forfeited.
True believers, without regard to a particular local church they identify with, must hold the Bible as authoritative. This applies to anyone who claims to be Christian, whether they are or not.
Where is this "rule" found in the Bible?
I'll give you a hint...it's not. It's nothing but a "tradition of men."
...that is achieved on the basis of their agreeing with His word.
So where is THIS rule in the Bible.
My point is that doctrines and practices advocated in this article are not supported in this article with Biblical evidence as the news source title might imply.
And my point is that yours aren't, either. The difference is the doctrines and practices of the Catholic Church were authoritatively developed with the mechanisms Christ gave to the Church He founded, and yours are based on accusations contrived to justify rebellion against that Church and hermaneutics designed to facilitate same.
“one can not show from the Scripture how this ‘support’ is gained or forfeited.”
I can. The scriptures assert their own authority. The meaning of most scripture is plain. The most essential message of God’s Word for our faith is simple enough for a child to understand. Of such is God’s kingdom. But these things are hidden from the wise and prudent.
“Where is this ‘rule’ found in the Bible?”
God has ordained that salvation is obtained through the simple message of the gospel.
Romans 1:16
For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes...
The essential message of the gospel is that Christ died, was buried, was raised from the dead, was seen by witnesses, ACCORDING TO THE SCRIPTURES. Any other imagined Jesus, not according to the scriptures is a false Christ.
Luke 24:44-48
Then He said to them, “These are the words which I spoke to you while I was still with you, that all things must be fulfilled which were written in the Law of Moses and the Prophets and the Psalms concerning Me.” And He opened their understanding, that they might comprehend the Scriptures. Then He said to them, “Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, and that repentance and remission of sins should be preached in His name to all nations, beginning at Jerusalem. And you are witnesses of these things.
1 Corinthians 15:1-8
Moreover, brethren, I declare to you the gospel which I preached to you, which also you received and in which you stand, by which also you are saved, if you hold fast that word which I preached to you—unless you believed in vain. For I delivered to you first of all that which I also received: that Christ died for our sins according to the Scriptures, and that He was buried, and that He rose again the third day according to the Scriptures, and that He was seen by Cephas, then by the twelve. After that He was seen by over five hundred brethren at once, of whom the greater part remain to the present, but some have fallen asleep. After that He was seen by James, then by all the apostles. Then last of all He was seen by me also, as by one born out of due time.
2 Corinthians 11:3-4
But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ. For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted—you may well put up with it!
Galations 1:7-9
...there are some who trouble you and want to pervert the gospel of Christ. But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed...
So where is THIS [on the basis of their agreeing with His word] rule in the Bible.
In the context of church authority, Jesus cited the unity of believers as the basis of acting with this authority both for discipline and prayer:
Matthew 18:18-20
Assuredly, I say to you, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. Again I say to you that if two of you agree on earth concerning anything that they ask, it will be done for them by My Father in heaven. For where two or three are gathered together in My name, I am there in the midst of them.”
Again, praying for the church, the basis of both faith and unity is God’s Word:
John 14-23
I have given them Your word; and the world has hated them because they are not of the world, just as I am not of the world. I do not pray that You should take them out of the world, but that You should keep them from the evil one. They are not of the world, just as I am not of the world. Sanctify them by Your truth. Your word is truth. As You sent Me into the world, I also have sent them into the world. And for their sakes I sanctify Myself, that they also may be sanctified by the truth. I do not pray for these alone, but also for those who will believe in Me through their word; that they all may be one, as You, Father, are in Me, and I in You; that they also may be one in Us, that the world may believe that You sent Me. And the glory which You gave Me I have given them, that they may be one just as We are one: I in them, and You in Me; that they may be made perfect in one, and that the world may know that You have sent Me, and have loved them as You have loved Me.
To not recognize this “rule” is evidence of the failure to discern the body of Christ, which is the church. Discerning His body is required for communion according to 1 Corinthians 11:28-30. And if you do not discern the Lord’s body, it is not truly the Lord’s supper, as this passage explains.