It is, however, pretty wonderful for the Big-Bang-is-creation view that light comes into existence on the first day, and God doesn't get around to making the sun until day four.
You are conflating a localized source of photonic emission with light.
Light is an electromagnetic field that permeates everything in and through. Without the field first there are no photons, there is no physics, no gravity.
God claimed to be this force. In all. Through all. Nothing could exist without it.
How would a primitive people know this, understand this? They could not. We certainly can.
