Only flat in the minds of the writers and readers of the Bible.
The oldest book in the Bible has always maintained.
shalom b'SHEM Yah'shua HaMashiach Adonai NAsbU Job 26:7 "He stretches out the north over empty space
And hangs the earth on nothing.
Hmmm, stretching of space. That is exactly what the Big Bang theory describes. Hanging the earth on nothing is pointedly obvious of reality.
I can't understand why these wacko Young Earth Creationists believe that the Big Bang theory conflicts with the Bible>