Genesis 6-8 tells of a global flood. This would need over 541 billion CUBIC KILOMETERS of water on a flat Earth, but less than five billion on a round Earth.
(One cubic kilometer is one trillion liters); This is because gravity would cause the water to bulge at the center of a flat Earth. It doesn't take a genius to know that the Earth doesn't have 541 billion cubic kilometers of water. So flat-Earthers, do you really believe the Bible, including Genesis 6-8? If you do, why are you still flat-Earthers?
Research Biblical Cosmology/ Spherical Earth.