Does the Quran say the earth is flat?
No verse states a shape, and the ones usually quoted are describing what a standing person sees — spread out, laid down, made walkable. The honest answer is that the text isn't making a cosmological claim either way, which is less satisfying than both the people quoting it as a miracle and the people quoting it as an error.
Why the usual answer falls flat
Both of the answers you’ve probably been given are doing the same thing: reading a seventh-century text as if it were a physics paper, then scoring it. One side finds a miracle in it; the other finds a mistake. Neither asks what the sentence was for.
The argument, properly stated
Write the reasoning out here — 400 to 800 words. Take the strongest form of the objection: it isn’t “the Quran says flat earth”, it’s “a text describing the world in the idiom of its first audience is doing description, not revelation of physical fact — so what else in it is idiom?” That’s a real question and it deserves a real answer rather than a deflection.
Where this argument stops
This settles the specific verses. It does not settle the general question of how you tell description from doctrine, and anyone who tells you there’s a clean rule for that is selling something.