It's an explanation for how God created life, if you believe God created everything.
That is what bugs me. Even when one reads Genesis 1 and believes that it is God's idea of a day at work (i.e. not 24 hours) there is nothing in the Bible that states that evolution could not have happened.
Those people who would posit that the Bible disallows evolution might want to realize the Bible also does not say that 2+2=4 either, but they do accept that.