Mangetout, does the Bible say the Earth is flat? No. Does it say the Earth is only 6000 years old? No. But vanilla apparently believes that, so she should believe the Earth is flat as well. And, frankly, it comes closer to saying the Earth is flat, as you’ll see below. Here is a little piece that I post when this topic comes up (and I’m around). In fact, last time I posted it was in a thread that you started. 
The late Isaac Asimov wrote an article about this subject, “The Circle of the Earth.” It is some 15 pages long, but I’ve done my best to summarize it here for you:
In Isaiah 40:22, the Bible (King James version) says, “It is he that sitteth upon the circle of the earth…” A circle, as you well know, is a two-dimensional figure; a sphere would be the proper three-dimensional structure. Obviously, the Earth is a sphere (well, pretty close) NOT a circle.
Another verse to the same effect is a passage in the Book of Proverbs, 8:27. “When he prepared the heavens, I was there: when he set a compass upon the face of the depth.”
A compass draws a circle – a flat circle. So, as Asimov says, “we can imagine God marking out the flat, circular disk of the world in this fashion.” But even “compass” is not the best translation from the Hebrew. The Revised Standard Version of the Bible has the verse as: “When he established the heavens, I was there, when he drew a circle on the face of the deep.” It’s even more specifically a flat circle.
As other evidence, the rest of the Isaiah 40:22 cited earlier says, “…that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in.” As we know, a tent is a piece of material “spread outward above and then down on all sides until it touches the ground. A tent is NOT a spherical structure that surrounds a smaller spherical structure. No tent in existence has ever been that.” (I.A.) And, of course, the ground underneath a tent is flat. Thus, according to this verse, humans live inside the tent of the heavens, on the flat Earth.
Now, of course with a flat Earth, what keeps everything from falling? Well, it rests on something. The Bible does mention, rather casually, what the Earth rests upon. Asimov contends that the Bible doesn’t go into more detail because everybody in the time period when it was written was assumed to “know” that the Earth is flat, the heavens are a tent, and the Earth rests upon pillars. But, like I said, there is a casual mention.
In the 38th chapter of Job, Job questions God about injustice and evil. God says to him, "Where wast thou when I laid the foundations of the earth? declare, if thou hast understanding. Who hath laid the measures thereof, if thou knowest? or who hath stretched the line upon it? Whereupon are the foundations thereof fastened? or who laid the cornerstone thereof? (Job 38:4-6)
So, what are these “foundations”? Well, since the Bible writers had never even heard of such things as mantle and the liquid iron core of the earth, and since they NEVER refer to the regions under the Earth’s surface as composed of rock and metal, it obviously isn’t that. So, we must come to the conclusion that the “foundations” of the Earth are the objects upon which the flat Earth rests.
Elsewhere in the Book of Job, Job says about God, “The pillars of heaven tremble and are astonished at his reproof.” So, it looks like we’ve found the “foundations” – the “pillars of heaven.”
There was more to the article, mostly dealing with hell below the circle of the Earth, but I think the point about the Earth being flat according to a literalist reading of the Bible has been made.
