There appears to be an intractable choice between family separation, on one hand, and a nation that does not enforce its own laws or protect its own borders, on the other. How to proceed? 
Peterson is not looking to illuminate the pages of the Bible per se. He seems interested in the Bible only insofar as the stories it contains connect with other mythical or symbolic stories throughout human history, and support his main thesis: that each individual should aim at that which is highest and organize life (and by extension, society) accordingly.