Sorry, but my assessment is correct - that much is actually missing.
Sure, you're convinced of that, I get it. And I'm sure to that you will say that your position is objective as can be. That's fine with me; I would just say again that it is not "missing" at all, it's all there; here's a comparison of 1 John 5:1-12 between the King James and the English Standard versions:
KJV
Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him. 2By this we know that we love the children of God, when we love God, and keep his commandments. For this is the love of God, that we keep his commandments: and his commandments are not grievous. For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world,
even our faith. Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? This is he that came by water and blood,
even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one. If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son. He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. And this is the record, that God hath given to us eternal life, and this life is in his Son. He that hath the Son hath life;
and he that hath not the Son of God hath not life.
ESV
Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the Father loves whoever has been born of him. By this we know that we love the children of God, when we love God and obey his commandments. For this is the love of God, that we keep his commandments. And his commandments are not burdensome. For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world ~ our faith. Who is it that overcomes the world except the one who believes that Jesus is the Son of God? This is he who came by water and blood—Jesus Christ; not by the water only but by the water and the blood. And the Spirit is the one who testifies, because the Spirit is the truth. For there are three that testify: the Spirit and the water and the blood; and these three agree. If we receive the testimony of men, the testimony of God is greater, for this is the testimony of God that he has borne concerning his Son. Whoever believes in the Son of God has the testimony in himself. Whoever does not believe God has made him a liar, because he has not believed in the testimony that God has borne concerning his Son. And this is the testimony, that God gave us eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life.
The exact wording may be a bit different, but the substance is very much the same ~
because of the continuing work of the Holy Spirit in maintaining the integrity of the Word of God. As Peter says (in referencing Isaiah), "the grass withers, and the flowers fade, but the Word of our God stands/endures forever."
Curiously, we have ancient letters written between the ECFs where they are referencing Bible verses (as Christians ordinarily would do today when corresponding with fellow Christians).
These letters are very old, older than the oldest Bible MSS.
Know what? The verses which these ECF refer to are MISSING from the Critical Text, but PRESENT in the Textus Receptus. So what does that tell you? That verses such as 1 John 5:7 KJV were "never there to begin with" as is argued by proponents of the Critical Text....or....were they in fact there to begin with - as evidenced by the ECFs quoting them - but later removed by those who "corrupt the word of God" (Colossians 2:17 KJV)???
In Colossians 2:17, Phoneman, Paul is talking about false teachers, and/or people who teach and practice things contrary to the Word of God. To this general comment I would continue in the same vein as immediately above, Phoneman, and say that
because of the continuing work of the Holy Spirit, the Word of God
cannot be corrupted ~ despite, certainly, continued efforts to do so; the continued exchanging of the truth for a lie, as Paul puts it in Romans 1 will be with us until the return of the King (Lord of the Rings reference...). But God's inerrant, infallible Word endures forever, because God ~ and everything about Him, including His Word ~ is perfectly holy, faithful and immutable.
Peace upon the Israel of God, the church.
We can certainly agree on that! :)
Grace and peace to you.