Jesus words "My God, my God, why have you forsaken me?"
Jesus did not experience reprobation as if he himself had sinned. But in the redeeming love that always united him to the Father, he assumed us in the state of our waywardness of sin, to the point that he could say in our name from the cross: "My God, my God, why have you forsaken me?" Having thus established him in solidarity with us sinners, God "did not spare his own Son but gave him up for us all", so that we might be "reconciled to God by the death of his Son".
Jesus was fully God and fully human. His humanity was displayed with these words as was his completion of the new covenant by quoting the words from the New Testament. Jesus wasn't just quoting for the sake of quoting. He was fully God AND fully human. Though He did not sin, He was tempted just as we are tempted.
Did you know that the documents in the Old Testament, and the New Testament were not actually written in English? The books of the New Testament were written by early Christians (aka Catholics). The current list of books of the Old and New Testaments was created in 393 A.D. at the Council of Hippo. This is the list used for the last 1700 years by Roman Catholics.
The New Testament was written by the Apostles, the first to spread the teachings of Christ. Following the same teachings and traditions of Christ through the Apostles, the Catholic Church, instituted by Christ, assembled the Bible, interpreted, and translated it into the vernacular.
I find it very incredible that a Christian tradition can adopt a book of religious teaching from one Church, remove it from the context of 1200 years of study and interpretation, then tell said Church they do not know their own holy book.
This is to say that apart from the teaching and interpretation of God through the Roman Catholic Church, understanding of Biblical teachings is incomplete. You're right that we shouldn't simply take everything the "stuffed shirt" says as Gospel. The teachings of Christ through the Catholic Church are not simply "this is what you believe, end of story". The gifts of logic and reason are applied, throughout the history of the Catholic Church, to fully understand Christ's teachings, and appreciate the mysteries of God.
However, it is utter arrogance to think that each person can interpret the Bible for themselves and thus each person will have the truth. That way of thinking is nothing more than theological relativism, a practice which leads to nothing but confusion and contradiction.