Christians, why does the Bible teach that the earth is flat?

Isaiah 40:22: "It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in:"

The earth is not a "circle"; a circle is flat. The earth is a sphere.
Update: Note that some people use this verse in an attempt to "prove" that the Bible speaks of unknown scientific facts. As I said above, a circle is FLAT.
Update 2: If I'm reading to much into what is "plainly figurative" then stop reading too much into it by attempting to make the Bible say "the earth is round" which it clearly does not.
Update 3: Darrin, to where in Job are you referring? Do you mean the verse that talks about the "breadth of the earth"?
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