Per Wiki:
The flat Earth model is an archaic conception of Earth’s shape as a plane or disk. Many ancient cultures subscribed to a flat Earth cosmography, including Greece until the classical period, the Bronze Age and Iron Age civilizations of the Near East until the Hellenistic period, India until the Gupta period (early centuries AD), and China until the 17th century. That paradigm was also typically held in the aboriginal cultures of the Americas, and the notion of a flat Earth domed by the firmament in the shape of an inverted bowl was common in pre-scientific societies.[1]
The idea of a spherical Earth appeared in Greek philosophy with Pythagoras (6th century BC), although most pre-Socratics (6th – 5th century BC) retained the flat Earth model. Aristotle provided evidence for the spherical shape of the Earth on empirical grounds by around 330 BC. Knowledge of the spherical Earth gradually began to spread beyond the Hellenistic world from then on.[2][3][4][5]
In the modern era, pseudoscientific[6] flat Earth theories have been espoused by modern flat Earth societies and, increasingly, by unaffiliated individuals using social media.[7][8]
You just affirmed with Wikipedia my assertion that early Christians were not flat earthers.
Actually Job, the oldest book in the Bible acknowledges that the Earth is a sphere suspended on nothing. Any Jew or Christian that studies Scripture knows the earth is round from the time Scripture was recorded