This is shown to be false simply by noting the pronouns that John uses in
1 John 1:6-10. As has been explained to you before,
Hopeful 2, John identifies himself with those to whom he's writing, using "we" and "us" as he addresses the matter of sin in the lives of born-again believers. In doing so, John denies the idea you've put forward above,
Hopeful 2.
Whether its
verse six:
1 John 1:6
6 If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth.
or
verse seven:
1 John 1:7
7 But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.
the pronouns John uses identify him with
both the person who walks in darkness and the one who walks in the light. So, then, what John is doing in
1 John 1:6-10 is speaking of a single person - the Christian - who can live in two different, contradictory ways: in the light or in the darkness.
What John wrote comports perfectly with the many other passages of God's word that demonstrate saints sin. See
1 Corinthians 3, 5, 6, 11, or
Galatians 3:3, or
Revelation 2-3, or
Hebrews 10:26-31, and so on. You can even read John's words in the very next chapter of his first letter to see that he was making this point:
1 John 2:1
1 My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous.
2 He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.
Who is the "anyone" who sins? In context, it is "My little children." And who are they? John clarifies their identity by using "we" in reference to them.
We have an Advocate," he wrote. By "we" John meant himself and his "little children" readers. These are they who, when they sin, have an Advocate in heaven with God, Jesus Christ the Righteous. John did not think of himself as an unsaved man, however. And so, when he lumped himself in with his readers by using the pronoun "we," he indicated that he understood his readers to be as he was: saved.
This is all reinforced by John then proceeding to distinguish his readers and himself - "our" in
verse 2 - from "the whole world,"
both of which groups, he wrote, have sins for which Christ was the propitiation. It is, then, a clear contortion of the obvious, natural reading of John's words to assert what you have about them
Hopeful 2.
Why, in the face of such plain, obvious facts do you persist in your deep error about them? It can only be, I think, that you are suffering under the self-deception and absence of Truth that God has promised you will in
1 John 1:8:
8 If we say we have no sin, we deceive ourselves, and the truth is not in us.