Well duh! There was no precursor Christian church from which to inherit our New Testament. Our original doctrine came directly from Jesus and from the Paraclete and was only gradually written down and canonized over the next three and a half centuries. Scriptural books were declared canonical or apocryphal based upon whether they made the cut of adherence to established Catholic doctrine.
Every part of the NT was reviewed with a fine-tooth comb by zealous Catholics. The last bishop to eliminate books was that hammer of heretics and bane of emperors, St. Athanasius of Alexandria. His final changes were canonized a few decades later by the council of Rome in the latter half of the Forth Century. Any biblical interpretation that finds fault with Catholic doctrine certainly conflicts with the interpretations of St. Athanasius and his fellow canonists. Otherwise, those books would have been eliminated like the rest.
Duh indeed. Otherwise there would be no Holy Scripture, no Church, no universal Christian faith. And without Catholic doctrine after the scriptures, the Church struggling against every possible manner of heresy which "proved" itself via scriptura, there would only be Arians and Nestorians and Sabellians, Monarchians, Gnostics, Modalists, etc., Not the One Christian Faith that those who left the Church took for granted.
And now, if they and we but look around, we can see what happens as centuries go by and the One Faith, One Baptism, for outside the authority of Church Doctrine inevitably leads again toward a vast cornucopia of fragmented teaching, with each individual sola, sola, sola, sola…
How many will there be from the offshoots of offshoots a century from now, five centuries from now?
So with all that why didn’t they make sure to get what the Apostles wrote about the bodily assumption of Mary in there? You would think with that being such an important part of Catholic belief the would have made sure to include what the Apostles wrote about that. I mean, surely the Apostles wrote about such and important event right? Especially John who took her in. Maybe you could find which one of the Apostles wrote about that?