Are you claiming expertise in biblical theology or in geology or both?
As a lay person with collegiate education in Biblical studies and at least a working knowledge in Geology, I am not claiming to be an expert in either field. But I know enough about both fields to completely disavow any literalist understanding of Genesis.
we need thinking people to convert to Christianity.
There are thousands, if not millions, of thinking people who have converted to Christianity. They are able to maintain their faith without assuming the fallacy of literal Biblical innerancy.
PS. Evidence that the world was flat, closer to a billiards ball, would be the fact that unlike you, I seem to believe that mountains weren't all "created" but evolved, along with other features of depression and elevation on the Earth. You don't think the Earth was created with all its mountains and depressions at the current heights and depths? Do you really? Really?!
...... No. Please pay attention.
I'm the one who explained Orogenies to you.
Let's find the most primordial piece of the Solar System that we have an image of and see if that object is flat, and devoid of ridges, valleys, cliffs, or mountains:
Are these devoid of elevation? Nope
Are these devoid of elevation? Nope.
Is Comet 67-P devoid of elevation? Nope
How about Proto-planets Ceres and Vesta?
What of Vesta's topography? It appears to be incredibly spherical, yet it has a mountain on it nearly twice the height of Mt. Everst. The highest point on Vesta is 12 miles above "sea" level...
Is this proto-planet devoid of elevation? Nope.
And Ceres, another and quite larger proto-planet, which would have been one of the stops in the development of the primordial Earth, is it devoid of elevation and spherical like a billiards ball?
See that little pimple right in the middle? It rises 5 kilometers from the surface. The other impressions that you see range anywhere from a few hundreds feet below sea level to thousands of feet in elevation. So no... Ceres is not devoid of elevation nor able to be completely flooded. Nothing with a solid surface in the known Universe exhibits the properties that you propose had to exist in order for the Biblical Flood to occur...
So if nothing else in the entire Solar System is perfectly round and flat like a billiards ball, and they are all readily observable, factual, examples of the different stages of planetary development, is it rational or logical to assume that Earth was any different from these objects? I mean, if we are only talking about the facts, and how the facts lead to a conclusion, then we have to admit that the Billiards Ball hypothesis is not based on evidence or facts at all, don't we?
Since there is absolutely no evidence for the Billiards Ball hypothesis, why do you continue to entertain it?
So, again I'll ask you, on what are you basing the idea that at some point in it's history Earth was as round and smooth as a billiards ball?
At which point in the History of the these other solar objects were they ever perfectly spherical, and as smooth-surfaced as a billiards ball?