My apologies, it was not job but Isaiah that said, He sits enthroned above the circle
of the earth. The hebrew word for circle is also rendered sphere.
I see you view on the word "hang" but I would perhaps disagree. If something hangs upon "something" then yes, it is held up. If it hangs upon nothing, it has the same state of not resting upon anything, but it is also not held up by anthing.
The four corners references in the bible are a symbolic reference, I believe it speaks of the angels of the four winds, which establishes that you cannot escape it wherever you hide. Revelation was hugely written symbolically, as it was the dream of John. Revelation was a sealed scroll in the sense that it would not be understood in its entirity until the appointed time came. If you took Revelations and read it with a literal mind, it would give you some pretty screwy imagery.
earth being spread out does not necessarily suggest the Earth is flat, but it is one way that you can interpret it. Each must find his own interpretation, and go with that.
another one I found interesting, Job spoke of being alive by the skin of his teeth. Science established only in the last two decades that we do indeed have a thin layer of skin on our teeth
he may have intended gums, but I like to give him the benefit of the doubt.