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I think I’ve presented myself adequately in other posts.

Vut you still haven't addressed this specific Scripture -- John 21:25:

John
Chapter 21

23: ¹³ So the word spread among the brothers that that disciple would not die. But Jesus had not told him that he would not die, just "What if I want him to remain until I come? (What concern is it of yours?)"
24: It is this disciple who testifies to these things and has written them, ¹⁴ and we know that his testimony is true.
25: There are also many other things that Jesus did, but if these were to be described individually, I do not think the whole world would contain the books that would be written.

So are you saying that you do not believe the Apostle John and what he wrote -- that all things could not be written down? Hence, Catholics know that there is such a thing as HOLY Tradition where the world of God was handed down from one person to another.

Do Christians Need Only the Bible?
[T]radition and [t]radition (and just what is the difference?) [Ecumenical]
What is Holy Tradition?
Why Does The Catholic Church Accept Traditions? [Ecumenical]

A Return to Tradition: A new interest in old ways takes root in Catholicism and many other faiths
Scripture Is Tradition
SCRIPTURE AND TRADITION
The Importance of Tradition Today
The Place of Custom and Tradition

Early Church Fathers on (Oral) Tradition - Catholic/Orthodox Caucus
Holy Tradition: The Road That Leads Home
On Holy Scripture and Holy Tradition
Recovering the Catholic Moral Tradition: The notion of happiness
Tradition and Reform

APOSTOLIC TRADITION: Consistency or Contradiction?
Can Vatican II be interpreted in the light of Tradition?
The New Mass: A Return to Tradition???
Pope praises Ukrainian-Catholic Church for upholding Sacred Tradition, communion with Seat of Peter
The Shadow Tradition - Magisterium vs Murk

[Catholic] Tradition catching on with Baptists [Ecumenical Ash Wed. Service]
Pope will preside at Ash Wednesday Mass, procession; act will renew ancient tradition
How Tradition Gave Us the Bible
Papal Supremacy Is Against Tradition
"In Light Of Tradition"... The Society Of St. Pius X And Vatican II