You are incorrect. We have known the world was round since the early days of Greece and Egypt. The only real debate was as to how far it was around the earth, or whether there was or was not more land on the opposite side of the world. The Circumference of the earth was calculated in Greece, and Egypt, and the existence of another Continent was predicted as well based on Calculations done Centuries before the Catholic Church was a twinkle in some Roman's eye.