Hello.
It’s a foolish question…
Why in the Bible God did not reveal anything beyond what humans knew with their scientific knowledge of the time?
But He did - though His revelation of Himself to mankind wasn't with the aim of lifting them into a greater knowledge of the physical world but of Himself and the spiritual realm.
Job 26:7
7 "He stretches out the north over empty space And hangs the earth on nothing.
This is a far more accurate description of the facts than, say, the world resting on the backs of four gigantic elephants who are standing on the back of a gargantuan turtle. The world rests upon nothing, traveling through space unmoored from any supporting structure just as the Bible indicates.
Genesis 1:1
1 In the beginning God created the heavens and the earth.
Here, too, the Bible turns out to be exactly right about the fact of the universe's beginning a finite time ago. As the Big Bang Theory, now well-accepted mainstream science, tells us, at a moment long ago all time, space, matter and energy came into being. Working from this fact deductively, one arrives at a timeless, immaterial, incredibly powerful, personal Uncaused Cause of the universe: God. (See the Kalam Cosmological Argument -
www.reasonablefaith.org)
Isaiah 40:22
22 It is he who sits above the circle of the earth...
Here, the Bible indicates a circular character to the shape of the earth. It doesn't say that the earth is a sphere, I understand, but "circular" is still nonetheless generally accurate.
And so on.
For example, why didn’t God reveal the germ theory of infections or particle theory of matter? Or heliocentric solar system? Why did He express Himself strictly at the scientific level of the day?
What is eternally important is that people know God, their Creator and Lord, and live in the manner and for the purposes for which He made them. Doing so is fundamentally and intimately connected to spiritual realities, however, not physical ones. God is a Spirit, the Bible declares, and walking with Him is spiritual business, not a matter of science.