As a christian, I always found this one a little hard to believe. I've read the bible, in multiple versions, and never saw anything that could be construed as saying the earth is flat.
First I would like to say that the Bible cannot prove Earth is flat. If the Bible says Earth is flat, then it is wrong.
As for verses that indicate Earth is flat, there are quite a few, which can easily be found by using Google. Even using sites which try to refute that idea.
Some verses indicate Earth has 4 corners, which makes no sense for a globe, but are often dismissed as more poetic talking.
But there are others, for example, we have Jesus being taken to the top of a tall mountain to be shown all the Kingdoms of Earth, physically impossible unless Earth was flat.
But perhaps the best is that found in Isaiah.
Isaiah 40:22
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 like a tent to dwell in;
This as a simple interpretation without trying to twist it to mean otherwise, indicates that Earth is flat, or mostly flat, with the heavens acting as a dome. There is literally no reason, from the Bible itself, to think otherwise. The only reason people have to think otherwise is because Earth is not flat and they think the Bible can't be wrong, so they need some way to pretend it isn't.
Yes, there are many translations, often by Chrsitians that want the Bible to be perfect who are happy to twist it to their liking.
They "above" part makes no sense in the context of a ball or globe, and the Hewbrews had a much better word for a globe than what translates to circle as they already had balls.
There are also weaker links, like in Genesis where God was creating the world taking days with evening passing and morning coming.
Unless god was only focusing on a single part of the world and ignoring the rest, that doesn't work for a globe. (and lets ignore the fact that you had day and night before the sun).
You then have other issues which match what often goes hand in hand with a FE (and contradicted by it with UA), that of Earth being fixed and stationary. Many FEers claim Earth is fixed and use that as an argument against the globe model, even though it is actually against the HC model (which typically has Earth being round).
The simple fact is that the Biblical depiction of the universe does not match the current scientific model of the universe.
So the options are to discard science like FEers, discard the Bible like non-Christians, pretend the Bible says something else, or accept the Bible is not a collection of inerrant facts, which is effectively discarding the Bible, while pretending to hold on to it.
Personally, I don't think a perfect God would make such mistakes with its holy book, even if those mistakes are just misinterpretation.
You should read this link from someone who has actually studied this https://www.lockhaven.edu/~dsimanek/febible.htm
Thanks for that. It is a nice site, with some verses I didn't know about.