Can we imagine a God of infinite glory and dignity who never had a beginning? Can we understand His existing from eternity, yet having no created universe over which to exercise authority? As to these things there are problems that our finite minds can never hope to penetrate. Genesis says nothing about them, but opens with the sublime declaration, "In the beginning God created the heavens and the earth." This is written for the sake of mankind, but God does not have to explain Himself to us.
The writer of Genesis, who was no doubt Moses (Luke 24:27) could not get his information from anyone but God. People have supposed that he gathered material for this book from other human sources, but this is settled by 2 Timothy 3:16: "All scripture is given by inspiration of God." Humans have imagined all kinds of silly answers to the question of origins, but none of these answers comes near to the majestic dignity and truth of what God has revealed in the book of Genesis.
Genesis, being the book of beginnings, has been called the seed plot of the Bible. It contains in admirable seed form all the truths that are later developed throughout scripture. Here is seen the beautiful simplicity of earthly life on earth before creation was so greatly marred by the complications that sin has introduced. Genesis symbolizes the life-giving work of God begun in a soul -- new birth -- with promise of fruit to come. The book specially revolves around the lives of seven outstanding patriarchs -- Adam, Enoch, Noah, Abraham, Isaac, Jacob and Joseph.