They still trust false science and ignore people like Enoch, Cosmas, Severian, Tertullian, Moses, St. John Chrysostom and Methodius because they aren't infallible.
So much for logic.
Speaking of logic, it is difficult to see the logic behind that list of people.
Enoch did not actually write the Book of Enoch and it, according to the Church, is apocryphal and has no authority whatsoever.
If the Cosmas you list is the sixth century proponent of flat earth, he was a travelling merchant who became a monk in his later years. The Catholic Encyclopedia writes:
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According to Cosmas the world is a rectangular structure in two sections, their length much greater than their breadth, and corresponding in form and proportions to the Tabernacle of the Old Testament. The base is formed by the surface of the earth, around which flows the ocean; on the other side of the ocean lies another — unknown — continent, from which rise the walls that support the firmament above. The stars are carried by the angels in a circle around the firmament. Above the firmament springs a vault which separates the heaven of the blessed from the world beneath. The theory that there is an antipodes, says Cosmas, is a doctrine to be rejected. The earth rises towards the north and ends in a cone-shaped mountain behind which the sun continues its wanderings during the night, and the nights are long or short according as the position of the sun is near the base or the summit of the mountain.
This curious attempt to harmonize a childish Biblical exegesis with ordinary phenomena and the current opinions of the time is at least superior to the extraordinary geographical hypotheses of that day. Aside from the fact that the theories of Cosmas exercised no influence, they are not of sufficient importance to affect the genuine worth of several portions of the "Topography".
Why would anyone accept something just because he wrote it? From what I have made out of your beliefs, even you do not accept everything in his theory.
You also include Tertullian on your list. Presumably you accept him as an authority because you do not know he became a heretic.
Look:It was after the year 206 that he joined the Montanist sect, and he seems to have definitively separated from the Church about 211 (Harnack) or 213 (Monceaux). After writing more virulently against the Church than even against heathen and persecutors, he separated from the Montanists and founded a sect of his own.
As for Severian: Posterity has preserved his name on account of the prominent but regrettable role which he played in the deposition and banishment of St. John Chrysostom.
You also have Moses on your list which presumably refers to passages from the first 5 books of the Bible. These, like all Scripture, are without error. This does not belong in the same list as the above fallible and suspect writings. Or do have some other work, supposedly by Moses, that you use as an authority.
You do not seem to have put any thought or research into your sources. You appear to assume that any source that supports flat earth must be legitimate.