The best evidence that the Bible teaches that the earth is flat is found in the following passages. The first is in Matthew:
"[T]he devil taketh him up into an exceeding high mountain, and sheweth him all the kingdoms of the world, and the glory of them"
(Matthew 4:1-12)
Certainly, if the earth were flat, standing atop "an exceedingly high mountain" would allow Jesus to see the whole earth, but there is no mountain tall enough to allow him to see the other side of a spherical earth. At most, one hemisphere would be seen, but not the other, unless the Bible is teaching us that Jesus had Superman-like "X-ray vision" which enabled him to see through the earth to kingdoms on the other side.
The other passage is in Daniel:
"The visions of my head as I lay in bed were these: I saw, and behold, a tree in the midst of the earth; and its height was great. The tree grew and became strong, and its top reached to heaven, and it was visible to the end of the whole earth." (Daniel 4:10-11)
The "whole" earth? No matter how tall the tree was, it would not have been visible from the other side of the earth. Only a writer who thought the earth was flat, or one who was merely repeating a silly folk tale, would have written such a thing.
If these writers had been inspired by a god to write these words, that god would not have let them suggest that the "whole earth" could be seen at once if one had a tall enough vantage point.
Joseph F. Alward
"Skeptical Views of Christianity and the Bible"
http://members.aol.com/jalw/joseph_alward.html