The purpose of the book "The Evolution of Genesis" is to take the Biblical stories out of the realm of mythology that a literal reading would suggest. It is intended to facilitate creationists acceptance of evolution.
So, to hell with what the authors of the Bible thought they were saying. Instead, lets make up new interpretations of their words that we can spin into being in line with scientific discoveries.
Not to mention the problems with a God leading a group to believe that they are his chosen people while actually lying about the whole thing so that some unrelated group thousands of years in the future will see that it really was some convoluted prophesy.