I'd point him to the book. You can pick it up on Audible for free if you've never joined before.
Here's
a presentation of John Walton >>LINK<<
>Genesis is an ancient cosmology (an ancient understanding of the world)
>The Israelites received no revelation to update or modify their “scientific” understanding of the cosmos.
>God did not reveal a new cosmic geography to the recipients of Genesis, rather he worked with what they had.
>There is no modern science embedded in Genesis.
Some Christians approach the text of Genesis as if it has modern science embedded in it or it dictates what modern science should look like. This approach to the text of Genesis 1 is called “concordism,” as it seeks to give a modern scientific explanation for the details in the text. This represents one attempt to “translate” the culture and text for the modern reader. The problem is, we cannot translate their cosmology to our cosmology, nor should we. If we accept Genesis 1 as ancient cosmology, then we need to interpret it as ancient cosmology rather than translate it into modern cosmology. If we try to turn it into modern cosmology, we are making the text say something that it never said. It is not just a case of adding meaning (as more information has become available) it is a case of changing meaning. Since we view the text as authoritative, it is a dangerous thing to change the meaning of the text into something it never intended to say.
John H. Walton, The Lost World of Genesis One: Ancient Cosmology and the Origins Debate (Downers Grove, IL: IVP Academic, 2009), 14–15.
Rob