Exodus 20:4. Proof that the world was flat when they wrote the bible. If god is all knowing, surely he wouldn't let such a verse be written this way. Especially since its his 3rd commandment. They'll probably say Moses just heard god wrong.
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This picture is supposed to be a good representation of how people in the world of that time thought of the earth. It doesn't show the pillars at the sides that connect the metal firmament to the earth.
When everybody knows it looks like this: