Christian flat-Earthers like to falsely assert that "The Bible is a flat-Earth book." They notoriously like to champion Isaiah 40:22 as their proof text for their absurd and nonsensical belief.
"It is He who sits above the circle of the earth, and its inhabitants are like grasshoppers, who stretches out the heavens like a curtain and spreads them out like a tent to dwell in." Isaiah 40:22
The word translated "circle" here is the Hebrew word chug (חוּג), which means, "circle, circuit, compass," (Strong's) and, "a circle, a vault, a horizon" (The Complete Word Study Dictionary). To Christian flat-Earthers, this appears as an open and shut case. It might be, if they actually understood how to read. More on that in a bit.
I had read somewhere once that supposedly in ancient Hebrew literature this word is used to describe the ball that children play with, but I am not so sure of that claim; I would have to see the evidence supporting it (as opposed to the writer making it up and lying through his teeth). I read elsewhere once that in modern Hebrew this word is used of a sphere, along with kaddur, galgal, and mazzal. The source provided for this was Ben-Yehuda's Pocket English-Hebrew Dictionary, p. 252. I have not been able to verify this yet.
Historical Latin translations of the Bible yield support for a spherical object as opposed to a flat circle. Santes Pagnino translated this word as sphaera, while Benedictus Arias Montanus and François Vatable translated it as globus. Others translated it as orbis.
"And roll you tightly like a ball, to be cast into a vast country; there you will die and there your splendid chariots will be, you shame of your master's house." Isaiah 22:18
The word translated "ball" here is the Hebrew word dur (דּוּר), which means, "a circle, ball or pile: ball, turn, round about" (Strong's) and, "a heap, pile, something balled up" (The Complete Word Study Dictionary). Is this the actual Hebrew word for a ball?
Earlier I stated that these Christians do not know how to read. What does Isaiah 40:22 say? Does it say anything about a circular Earth? No, it does not. What does it say? "It is He who sits above the circle of the earth" The focal point here is the circle, not the Earth; much like you would say, "the rings of Saturn." You are talking about the rings, not about the planet Saturn. Isaiah is talking about the constellations in the expanse of the heavens that encircle the Earth. Pay close attention to the rest of the verse, following the context of the circle: "who stretches out the heavens like a curtain and spreads them out like a tent to dwell in." Even if the word does refer to a spherical shape, "the sphere of the earth" would still be talking about the expanse that encircles the entire Earth; on all sides.
"Clouds are a hiding place for Him, so that He cannot see; and He walks on the circle of heaven." Job 22:14
This passage uses the same Hebrew word. In the NASB it is translated as "vault," as supported by The Brown-Driver-Briggs Hebrew and English Lexicon. God is said to walk on the circuit of heaven. God's home is above the tabernacle of stars which surrounds the globe Earth as a curtain.
If you are a Christian who believes in the flat Earth theory, here is a book that provides explanations to give proper context of every Bible verse cited by flat-Earthers in their attempt to try and justify the flat Earth concept. If you would like to look at the actual facts that debunk the flat Earth theory, visit this site.