That is NOT universally accepted. Not even the Orthodox Church makes that claim.
The most renowned universities in the world have schools of theology and divinity staffed by outstanding scholars. The difficulties you appear to encounter are best addressed to such departments or you consult the many scholarly books and treatises on the subject
There are many renown scholars who do not find flawless perfection in what is sacred text to some.
A good starting point is the book “On The Way To Jesus Christ” by Ratzinger (now Benedict XVI) who has been hailed as the “theological Einstein of our times”
Within the Catholic theological community, Pope Benedict XVI is certainly a well respected theologian. He is also well respected among the Eastern Orthodox for his distinctly Patristic understanding of the Church which is near and dear to the East. But even something as theologically close as the Orthodox Church, by necessity, finds fault with some of his theology.
That doesn't make him universally a theological Einstein; only within his community of believers, but I am sure there are some top Catholic theologians who disagree with him on something.
I agree with all your observations.
If there were “universal” agreement to the point of “flawless perfection” the need for schools of theology and divinity would be unnecessary.
Yet, for over two millennia, no other text sacred or otherwise, and no other institution religious or otherwise, has undergone the rigors of such searching scrutiny and still have within its ranks leading scientists, inventors, discoverers, poets, writers, artists, sculptors, philosophers, scholars, and former communists, atheists and agnostics from every part of the world and from all persuasions. Unlike any other, the powerful confluence and effect of faith and reason in establishing authenticity of scripture and Catholic Church cannot be denied.