What about verse Isaiah 40:22 ?
Well, rather than me tell you what to believe; what do you think?
Look at the verses before this:
Surely the nations are like a drop in a bucket;
they are regarded as dust on the scales;
Is this literal? Are the nations a drop (a drop of what?) Or dust?
The author is comparing them to something; the word "like" is a simile.
17 Before him all the nations are as nothing;
they are regarded by him as worthless
and less than nothing.
ARE the nations of the world nothing? Christians would surely say that they were all created by God, that he died for all in them and they are of great worth.
But
compared with God's might and great power; they are nothing.
18 With whom, then, will you compare God?
To what image will you liken him?
I would say that is a rhetorical question; how can the mighty, powerful Creator of the universe be compared to anything man-made?
Besides, the Jews knew they were forbidden from making idols of anything.
21 Do you not know?
Have you not heard?
Has it not been told you from the beginning?
Have you not understood since the earth was founded?
22 He sits enthroned above the circle of the earth,
and its people are like grasshoppers.
He stretches out the heavens like a canopy,
and spreads them out like a tent to live in.
Compared with an idol, which is made by a human hand; God is all-powerful. Even if an idol is overlaid with silver and gold, it cannot compare with God. He founded, and created, the earth; God is so majestic, awesome and powerful that all the nations appear to be like specks of dust and their people like grasshoppers.
Is that literal? Are you a grasshopper and do you live inside a speck of dust? Look at verse 31 of that chapter; do you literally have wings like an eagle?
Look at other verses in Scripture; we are God's sheep, Psalm 23:1, Psalm 100:3. We are branches, John 15:5. So which is it; are we grasshoppers, sheep or branches on a tree? Or are we human beings, made in God's image, Genesis 1:26, known by God before we were born and "fearfully and wonderfully made", Psalm 139?
The chapter is one of comfort and hope, after the judgement, punishment and threats of exile in the first 39 chapters of Isaiah.
It is talking about God's power, majesty and ability compared with idols, who can do nothing. Even the other nations, who may have been threatening war and looked powerful or invincible, are nothing before God.
It is not a chapter about creation - and it certainly doesn't teach that the earth is a circle.