Many if not all human societies have origin myths and they differ greatly.
Several years ago a San Francisco-born-and-raised woman told me she is a materialist.
An hour ago a woman who was raised a Jehovah Witness and has left that faith told me the Big Bang story grew from a human need for a beginning. I agreed.
Can you wholeheartedly accept that the universe had no beginning, that it has always existed?
Alexis, you are correct that the universe is everything.
Parts of it are moving but there is no evidence that it is expanding.
1) ignored Edwin Hubble's warning that red shift might not indicate distance,
2) assumed that the Doppler Shift for sound in air applied to light in space,
3) concluded that galaxies are moving.
4) Ran the equations in reverse, and
5) wrongly concluded that he had proved Genesis in the Jewish Bible.
Do you know these terms and what they represent?
Alexis, in a dictionary some years ago I saw cosmology defined as astronomy plus metaphysics. I haven't seen a similar definition in other dictionaries.
The OED says modern cosmology brings together observational astronomy and particle physics. In recent years particle physicists have seemed able to create particles needed by cosmologists who depend solely on gravity.
I'm too much a materialist to be a Platonist.