Why is the Church (catholic) fundamental? and Why is Jesus Christ primordial?

Answer 1

--Is Catholic--

First there is a difference between "fundamentalist" and "fundamental". The Catholic Church rejects fundamentalism as heretical. You can read about fundamentalism here
http://www.catholic.com/library/Fundamentalism.asp

The Catholic Church is fundamental because she is dogmatic. In other words, she makes objective proclamations about the nature of reality, including the human condition, the correct path that one should lead ones life by, revealing the true nature of God to the world, and helping people to enter into a genuine relationship with God.

We can also say that the Church is fundamental in the sense that she is necessary. She is necessary for a righteous life, a right relationship with God, and for salvation. The Church is a key corner stone in the order of Creation, the Plan of God, the saving work of the Trinity, and the unfolding of the Kingdom of God.

Suggested readings
Vatican II
Catechism especially paragraphs 811- 870
Dominus Iesus

Principles of Catholic Theology: Building Stones for a Fundamental Theology (Paperback)
by Joseph Cardinal Ratzinger

Why is Jesus Christ primordial:
Because "In the beginning was the Word, and the Word was with God, and the Word was God". Besides the revelation of scripture there are other ways that we can show this to be true, even if not quite as exact as the true revelation. Platonic philosophy discusses the creation of the world as by God and the Word (logos) although they are not seen as united. Late Judaism has a rudimentary concept of God being Triune and speaks of God, Word, and Spirit.

Because Christ "eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, of one Being with the Father" Christ is primordial and before all things.

Answer 2

The Catholic Church is the only church that Jesus ever founded for the salvation of mankind.

Jesus is God, the Lamb slain before the foundations of the world, co-equal and co-eternal with the Faher and the Holy Spirit.

The church understood this fact from the earliest days, but finally decided to make an official written pronouncement on the matter at the council of Nicea, in order to combat a number of rampant heresies that still appear to exist, today.

Answer 3

What do you mean by fundamental? I'm not sure it is.
and
Jesus is/was/will be primordial because as part of the Holy Trinity, or being God He has always existed.

Answer 4

Jesus WAS/IS never was part of the Holy Trinity. He was HUMAN!!! He was only voted "God's Son" with barely a majority by a group of rich, well fed business men.

And the Catholic Church is funda- MENTAL. Sorry, that was just too easy! No, I'm not sure I quite understand that part of your question either.