"and God said, let there be light"................
sorry, my friend, but you do not know. you only believe what is written in a book
by asserting you know, you are asserting you were there at time of creation which means you existed before God or that God created you before it created the universe
you do not know, TB
you only believe
I recommend you follow the example of the churches when they wrote their creeds, which start with the words: