God made the world and everything in it. The Bible begins with the history of creation in Genesis 1 and 2.
God did this in 6 days, saw it was good and rested on the 7th day: This was not because He was worn out, but in the sense that He simply took a break. Maybe He also took a moment to savour His handiwork.
There was no chaos, or big bang as scientists theorize: Indeed, 'the big bang' is just that, a theory.
God is the God of order not chaos. The Bible is God's words written down for us His children, who of course He also made and loves.
Who Made God?
God is! No-one made God: He has always existed. He is! Omnipresent - All Around Omnipotent - All Powerful and Omniscient - All-Knowing.
Isaiah 44:6 Thus saith the Lord the King of Israel, and his redeemer the Lord of hosts; I am the first, and I am the last; and beside me there is no God.