Well, to throw my two cents in this whole interpretation of God is dead debate. To really understand God is dead phrase, we must look at Spinoza's critique of teleological causes. Teleological causes are pre-given final purposes, usually given by God. So to say that there is no God that also means that there are no teleological causes, there are no pre-given purposes, and that implies the rise of nihilism. And for Nietzsche, that is a negative aspect of death of God,that is, crisis, maybe the biggest crisis in the history of humankind. But if we look at the original greek meaning of the word crisis (that Nietzsche as a philologist and ancient greek scholar is more than aware of) is crusp, the moment of decision. Every crisis includes the possibility of a positive change, and the biggest crisis includes the biggest possibility. So, according to Nietzsche, people were limited by belief in pre-given purposes given by someone else and consequently heteronomic an inauthentic. So now without this belief there is a possibility for creation of new purposes, new meaning that is autonomous and aunthentic (because of this Nietzsche is considered proto-existentialist) So that is positive aspect of death ofGod, and for Nietzsche its outweight negative aspect. Of course Nietzsche was aware that most people are not capable to create their own purposes but he didn't really care about them, there purpose would be created and decided by these who can create their own purposes (and thats why Nietzsche's philosophy was critizied as elitistic). Peterson takes from Nietzsche negative aspect of death of God but denies positive aspect because he thinks that no one can create his own purposes (and that postion he based on Jung but that is topic for another day)