The 1 book of John was/is a response to a letter John received from a Gathering of believers. John was on the Island of Patmos. He got a letter from the leader of the gathering of People, that were in disagreement over being forgiven by God through Son Jesus for them.
read it from verse 1. This letter he received was people there then did not believe Jesus came in the flesh.
Read it verses 1-3
Stated truth, we have tasted, touched ate with Jesus
1John 1
Authorized (King James) Version!John
That which was from the beginning,
which we have heard, which we with our eyes, which we have looked upon, and our hands have handled, of the Word of life; (for the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us
that
which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship
is with the Father, and with his Son Jesus Christ. And these things write we unto you, that your joy may be full.
That was the purpose of that letter to correct the people now known as Gnostics, those that do not beleive Jesus Christ came to earth in the flesh, since they heard No Flesh can please God/ So they developed a belief, Christ could not have come here on earth in flesh and blood and therefore never was sacrificed for any sin.
Jesus the Son is the only one perfect, never born of Man, yet born of Woman, not Man (Hebrews 7:11-12)
When the real true Greek reading from the Greek inherent writing states, to
have past tense forgiven us all our sin. That is done. If anyone does not admit to their sin(s) then they are not in willing trust to Father needing Father to teach them new and love all, yes even those that have harmed you. That does not mean one has to keep company with others. Free choice, just please see to not have anything against anyone, since God holds nothing against us by Son for us all (Romans 2:1-4) done once for everyone to trust God in belief to this amazing gift given free of charge. it is the risen Life that saves, not the death, the death was needed first though Wow, woe is me as in Isaiah 6:1-7
PS: there are at least forty other verses that state the forgiveness is now past tense, reconciliation given
Only one passage 1 John 1:9 that seems to state differently, and is mistranslated from original Greek