"In the beginning, God created the heavens and the earth." Genesis 1:1
The bible assumes that God exists. The biblical writers realize that God's evidence is so self-evident, that they do not even need to try to prove the point. It ought to be clear to all.
In fact, it is so clear that anyone denying the existence of God is described as a "fool."
"The fool says in his heart, 'There is no God.'" Psalm 14:1