I see a lot of assumptions getting in the way on this thread. I just read what the Bible says and try to visualise what is being said.
"In the beginning" in Genesis 1:1 has to mean the beginning of material creation. In this instance, the "beginning" of the universe...."the heavens and the earth".
The word "heavens" has different meanings dependent on the context.
1) It can mean the sky where the birds fly, or....
2) it can mean the place where the heavenly bodies are seen...
3) it can mean the invisible realm where God and his angels reside. It has the connotation of something high and lofty....."up there".
The word "beginning" can also be confusing....e.g. Jesus is said to be "the beginning of the creation by God" (Revelation 3:14) Since Jesus was present at the creation of material things, (Genesis 1:26) the "beginning of God's creation" obviously means that his creation also extends to the spiritual realm.
Reading the account with a visual image of God creating the universe in one colossal act (the Big Bang) helps us to read the rest of the account accordingly. Since water is mentioned at the outset, it is apparent that the whole planet was at first completely covered in water (created that way) and that God separated the waters to become a canopy above the atmosphere, creating the "heavens" below it where birds fly and where our life sustaining oxygen is trapped, (thankfully) and the waters on the surface of the planet where God eventually made dry land come up. No longer formless or void, earth began to be prepared to host life.
When people start imagining all sorts of other things, then I can't understand where all those things come from. I try to visualise what they mean but I guess they read the words differently to me.