No answer will be forth coming since the Lord never said the earth is flat.
In FACT, GOD demonstrates His Creation from His Word in Genesis that the earth has a Level surface by which the mountains, the valleys, the very DEEP oceans, lakes an drivers have been carved and shaped upon and in.
Anyone who believes/trust the globalists from Babylon are under their deception, concerning the earth being a globe.
Because back then everyone was either catholic or reformed so they were all believing false doctrine.
The catholic and the reformed were murdering people who did not believe their false doctrine.
This is how we know both camps are servants of the devil because they think it's OK to murder people they disagree with.
The RCC is a very terrible evil that also deceives millions.
However, because you are currently indoctrinated by the globalists,
as i was and most of the world, you failed to understand Genesis.
There are TWO FACTUAL accounts as to why they believed you would fall off the edge of the earth.
#1 - Is the FACTUAL SCIENTIFIC OBSERVENCE of WATER = 24/7 seeks its own Level and impossible for WATER to cling to a spiraling globe.
#2 - No one, at that time, had been to the edges of the earth to SEE the ICE WALL Barrier that GOD created.
#3 - No one had, at the time and possibly today, gone over the ICE WALL and beyond.