Air needs wind. God needs nothing.
The Bible told me. Oh my! I may or may not have figured it out myself. I'll never know.
Ah. Who told you the Bible is credible? Why not the Qu'ran? 1.1 billion people believe it is the perfect and inalterable Word of God. Could they possibly be wrong? Of course they can. Could your belief that the Bible is the perfect and inalterable Word of God possibly be wrong too?
Anything you figure out for yourself that involves the creation of the universe is going to be very, very simple and will by definition be wrong.