OK, then what passages suggest flat earth? If it's not in the Bible explicitly, then it's the product of interpretation from some Church Fathers and, in that case, the teaching of Providentissimus Deus by Pope Leo XIII applies.
Forgive me for this, I pulled several passages from various places and they are not organized as I'd like.
Isaiah 40:22 It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in:
Isaiah 44:24 Thus saith the Lord, thy redeemer, and he that formed thee from the womb, I am the Lord that maketh all things; that stretcheth forth the heavens alone; that spreadeth abroad the earth by myself;
Isaiah 48:13 Mine hand also hath laid the foundation of the earth, and my right hand hath spanned the heavens: when I call unto them, they stand up together.
Isaiah 66:1 Thus saith the Lord, The heaven is my throne, and the earth is my footstool: where is the house that ye build unto me? and where is the place of my rest?
Ezekiel 1:26 And above the firmament that was over their heads was the likeness of a throne, as the appearance of a sapphire stone: and upon the likeness of the throne was the likeness as the appearance of a man above upon it.
Amos 9:6 (NASB) The One who builds His upper chambers in the heavens And has founded His vaulted dome over the earth,
He who calls for the waters of the sea And pours them out on the face of the earth, The Lord is His name.
Job 9:6 Which shaketh the earth out of her place, and the pillars thereof tremble.
Job 26:7 He stretcheth out the north over the empty place, and hangeth the earth upon nothing.
Job 26:10 He hath compassed the waters with bounds, until the day and night come to an end.
Job 28:24 For he looketh to the ends of the earth, and seeth under the whole heaven;
Job 37:3 He directeth it under the whole heaven, and his lightning unto the ends of the earth.
Job 38
1 Then the Lord answered Job out of the whirlwind, and said,
2 Who is this that darkeneth counsel by words without knowledge?
3 Gird up now thy loins like a man; for I will demand of thee, and answer thou me.
4 Where wast thou when I laid the foundations of the earth? declare, if thou hast understanding.
5 Who hath laid the measures thereof, if thou knowest? or who hath stretched the line upon it?
6 Whereupon are the foundations thereof fastened? or who laid the corner stone thereof;
7 When the morning stars sang together, and all the sons of God shouted for joy?
Job 38:13 That it might take hold of the ends of the earth, that the wicked might be shaken out of it?
1 Samuel 2:8 He raiseth up the poor out of the dust, and lifteth up the beggar from the dunghill, to set them among princes, and to make them inherit the throne of glory: for the pillars of the earth are the Lord's, and he hath set the world upon them.
1 Chronicles 16:30 Fear before him, all the earth: the world also shall be stable, that it be not moved.
Psalm 18:15 Then the channels of waters were seen, and the foundations of the world were discovered at thy rebuke, O Lord, at the blast of the breath of thy nostrils.
Psalm 75:3 The earth and all the inhabitants thereof are dissolved: I bear up the pillars of it.
Psalm 96:11 Let the heavens rejoice, and let the earth be glad; let the sea roar, and the fulness thereof.
Psalm 102:25 Of old hast thou laid the foundation of the earth: and the heavens are the work of thy hands.
Psalm 136 5 Who laid the foundations of the earth, that it should not be removed for ever.
27 When he prepared the heavens, I was there: when he set a compass upon the face of the depth:
28 When he established the clouds above: when he strengthened the fountains of the deep:
29 When he gave to the sea his decree, that the waters should not pass his commandment: when he appointed the foundations of the earth:
Isaiah 11:12 And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four corners of the earth.
Isaiah 40:22 It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in:
Isaiah 43:6 I'll say to the north, 'Give them up'! and to the south, 'Don't keep them back!' Bring my sons from far away and my daughters from the ends of the earth—
Daniel 4:
10 Thus were the visions of mine head in my bed; I saw, and behold a tree in the midst of the earth, and the height thereof was great.
11 The tree grew, and was strong, and the height thereof reached unto heaven, and the sight thereof to the end of all the earth:
Matthew 4:
8 Again, the devil taketh him up into an exceeding high mountain, and sheweth him all the kingdoms of the world, and the glory of them;
9 And saith unto him, All these things will I give thee, if thou wilt fall down and worship me.
Matthew 24:31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
John 17:24
Father, I desire that they also, whom thou hast given me, may be with me where I am, to behold my glory which thou hast given me in thy love for me before the foundation of the world.
Revelation 1:7 Behold, he cometh with clouds; and every eye shall see him, and they also which pierced him: and all kindreds of the earth shall wail because of him. Even so, Amen.
Revelation 7:1 And after these things I saw four angels standing on the four corners of the earth, holding the four winds of the earth, that the wind should not blow on the earth, nor on the sea, nor on any tree.
Revelation 20:8 He will go out to deceive Gog and Magog, the nations at the four corners of the earth, and gather them for war. They are as numerous as the sands of the seashore.
Scriptures concerning the nature of the sun, moon and stars:Genesis 1:
14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
15 And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.
16 And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
17 And God set them in the firmament of the heaven to give light upon the earth,
18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
Psalms 19:
1 The heavens declare the glory of God; and the firmament sheweth his handywork.
2 Day unto day uttereth speech, and night unto night sheweth knowledge.
3 There is no speech nor language, where their voice is not heard.
4 Their line is gone out through all the earth, and their words to the end of the world. In them hath he set a tabernacle for the sun,
5 Which is as a bridegroom coming out of his chamber, and rejoiceth as a strong man to run a race.
6 His going forth is from the end of the heaven, and his circuit unto the ends of it: and there is nothing hid from the heat thereof.
Ecclesiastes 1:5 The sun also ariseth, and the sun goeth down, and hasteth to his place where he arose.
Joshua 10:13 And the sun stood still, and the moon stayed, until the people had avenged themselves upon their enemies. Is not this written in the book of Jasher? So the sun stood still in the midst of heaven, and hasted not to go down about a whole day.
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This list is not exhaustive, its just what I could gather for the moment. Let me point out something: if we are to take scripture literally when it comes to the sun moving (as St. Robert Bellarmine explains in 1633), or when Jesus tells us to eat His body and drink His Blood, then why should we not take literally that the earth is set on pillars, has four corners, is hung on nothing at the bottom of creation, etc. Historian Dickenson White admits the Catholic case for flat earth is based in tradition and scripture when he says of 6th century writer Cosmas Indiocopleustes:
Nothing can be more touching in its simplicity than Cosmas's summing up of his great argument, He declares, "We say therefore with Isaiah that the heaven embracing the universe is a vault, with Job that it is joined to the earth, and with Moses that the length of the earth is greater than its breadth."