Part 2 of Internal Evidence for 1 John 5:7's True Authenicity from Scripture:

👉Without all 1 John 5:7 being inspired, preserved Scripture (including the part of 1 John 5:7 that sadly is called as "Comma Johanneum" by Bible deniers, Bible agnostics/those who deny the existence of one perfect Bible in English such as James White, all modern versionist promoters, all cults, & all critical text proponents), then verse 9's/1 John 5:9's words of "the witness of God is greater" would not match up with verses 7 and 8's respective Witnesses in heaven and witnesses in earth because you need to have BOTH the heavenly witnesses (which are "the Father, the Word, and the Holy Ghost") AND the earthly witnesses (which are "the spirit, and the water, and the water), in order for the witness of God (in heaven) to be greater than the witness of men (in earth)!!!

1 John 5:7-8 KJB
[7] For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. [8] And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.
[9] 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.

👉Removing 1 John 5:7 from the Scriptures in 1 John, breaks the parallel structure of the Scriptures contrasting the witnesses in heaven ("the Father, the Word, and the Holy Ghost") with the witnesses in earth (of "the spirit, and the water; and the blood,"
AND the three in heaven contrasted with the three in earth. Also, removing 1 John 5:7 (including "Comma Johanneum") breaks the threefold record from 1 John's verses 7's heavenly witnesses, verse 8's earthly witnesses, and verse 10's record/witness of God giving eternal life found in His Son, which all bear witness to Jesus Christ. Notice the underlined and bolded words, along with the words that are both underlined and bolded

1 John 5:7-8 KJB
[7] For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. [8] And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.
[11] And this is the record, that God hath given to us eternal life, and this life is in his Son.

These above words leads us to the next 2 points:

👉Without 1 John 5:7, we have no heavenly witnesses to both Jesus Christ's deity as him being God the Son/the Word AND no witnesses to when Jesus Christ came in the flesh. BUT with God preserving 1 John 5:7 as inspired Scripture, we have record of the heavenly witnesses ("the Father, the Word, and the Holy Ghost") bearing record/bearing witness to the fact that Jesus Christ came by water and blood, as shown from all 1 John 5:6 to 1 John 5:7.
1 John 5:6-7 KJB
[6] 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. [7] For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.

👉Moreover, without 1 John 5:7 being inspired, preserved Scripture, we would not have the witness of God testifying to his Son in 1 John 5:9 and we would have not have God the Father and God the Holy Ghost bearing record and witnessing to God the Son/the Word (Jesus) and that he came by water and blood.
1 John 5:6-7 KJB
[6] 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. [7] For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
[9] 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.