You received your faith because somebody -- in fact, quite a few people -- put together the Holy Scripture and the Holy Tradition for you to pick what you like and decide you've got faith. Your faith did not come from the island you proclaim yourself to be.
The church is made up of all true believers. The church does not predate the word of God nor the naming of the elect. To venerate the earthly institution over the eternal sacrifice is error.
It is the historical fact that the Church exists since the Pentecost (in fact, Protestants like to start it from Adam), and the scripture followed by a few decades; the canonization did not happen till late 4th c. Christ called the Church "his", -- please reconsider "earthly".
"the church is the mother of our new birth, but not the author of our salvation"??? Say what?
We receive baptism from the Church, and the Church received the gift to give it from Christ, Who then is the Author of the salvation therein. I don't know what you do on your island.
"The church guards the memory of Christ's words"? Why not the words themselves, and not just the "memory" of them?
Because " there are also many other things which Jesus did; which, if they were written every one, the world itself, I think, would not be able to contain the books that should be written."
Speaking of guarding the words themselves, can you think of any thief who stole 7 books of the word of God? I can.
"Unanimous voice"? Hardly
On the matter of faith, there is no dissenting voice in the Church. See the Canons of St. Vincent of Lerins.
"Tradition" by definition, changes with time and circumstance
Not by the Church's definition. We distinguish between the Holy Tradition that is immutable, and local and temporal traditions such as the liturgy rubrics and priest disciplines that can change because and when they should change.
"So then faith cometh by hearing, and hearing by the word of God." (Romans 10:17)
And the Church is the speaker, as previously explained.
So men's belief in Jesus Christ is an act of the organization of the church?
Men's belief in Jesus Christ depends on the knowledge of Jesus Christ, received from the Chruch who is sent by Him and intimately knows Him.
questionable addendum
But of course. The Church established the canon and discerns the authentic tradition. You on your island cannot do it even if you wanted to.
I praise you for reading the Catechism, and urge all who like you, are curious about the teaching of the Catholci faith do read it and see what our faith is for yourselves.
This is an example in support of my objection to all of the doctrines and traditions of mortal men (Mark 7:7) - in that it attempts to anthropomorphize God - by attributing the power of God to man.
My sheep hear my voice, and I know them, and they follow me:
And I give unto them eternal life; and they shall never perish, neither shall any [man] pluck them out of my hand.
My Father, which gave [them] me, is greater than all; and no [man] is able to pluck [them] out of my Father's hand.
I and [my] Father are one. John 10:26-30
It is a Spiritually perilous thing for anyone to put himself between Jesus Christ and one of His sheep as we can see in Matthew 23 and again here:
I don't fall down to the stock of a tree.