Genesis 1-11 is often referred to as Israel’s “pre-story”. The 3 stories (creation, flood, tower of Babel) of this section told the covenant nation of Israel about her beginnings. These stories gave her a sense of God greatness and power and her need for his redeeming grace. This earliest confession of God’s people sets the stage for the longer story of his dealings with them that begins with Abraham.
Here’s an audio file of the sermon if you missed it or want to hear it again.