There are well over 200 verses in the Bible that support a flat earth.
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Only if those verses are read in a non-Christological, hyper-literal manner, which is why we don’t find among the writings of the Early Church Fathers any writings that support a flat Earth doctrine.
On the contrary, a spherical Earth is upheld explicitly in the writings of St. Basil of Caesarea, St. Ambrose of Milan, and Origen Admantius, to name three of the most important early Church Fathers*, whose defense of Orthodox doctrine in the face of Gnosticism by Origen, and the defense of the doctrine of the Incarnation against the non-Trinitarianism of Arius, Macedonius and other fourth century heretics by St. Basil and St. Ambrose can only be described as stalwart.
If the correct exegesis of the Old Testament of these verses, known even then to be poetic rather than descriptive, since most educated people at the time of Christ were aware the world was round, and this would remain the case throughout the next millenium with only a slight reduction due to the impact of Mohammed’s claim that the world was flat, that the disappearance of the sails of ships below the horizon was an optical illusion, and his narration of Alexander the Great (who Muslims revere as a prophet, daring to place the heathen tyrant in the same category to which they blasphemously reduce Christ our True God, the only begotten Son and Word of the Father who became incarnate for our salvation, through his glorious and triumphant passion on the Cross, and who together with the Father and the Spirit is one God, holy and undivided, to whom alone is due all adoration and worship, now and ever and unto the ages of all ages), required a belief that, against all evidence, and for no logical reason, God had created a flat world, then we can rest assured that these three pious fathers of the Church would have called our attention to the fact.
But as we know, the world is not flat (for if it were flat, everything, from the distances between cities in the Northern Hemisphere, to the the flights that connect the Southern hemisphere, to the movement of celestial bodies, and the appearance of the horizon, would be different. Indeed, travel times between cities in the Northern Hemisphere as well as between cities in the Southern Hemisphere and the distortion they would experience under the model favored by members of the Flat Earth movement are among the more obvious proofs, along with the horizon itself, which prompted the celebrated experiment of Erastothenes in the third century B.C. which enabled a remarkably accurate calculation as to the diameter of the world.
*I would argue, controversially, that St. Ambrose was the most important Latin-speaking church father, more influential in the long run in terms of his impact on the liturgy and his widespread reception by Eastern Christendom than the celebrated St. Augustine, who is perhaps the most important church father in the West, but in the East, is scarcely read at all, and mainly for moral edification, with the doctrinal views of St. Augustine being rejected in favor of the alternative anti-Pelagian hamartiology of St. John Cassian and the more ancient sacramental theology of St. Cyprian of Carthage, who interestingly enough, were also Western church fathers, so the reluctance of the East to embrace Augustinian doctrine was not by any means an example of anti-Occidental prejudice).