In the new covenant, God doesn't want us to be blessed when we obey the law and cursed when we fail. Doesn't such a system sound awfully similar to the old covenant? Grace is the undeserved, unmerited and unearned favor of God - the moment you try to merit the free favors of God, His grace is nullified.
The sense that the meaning of the universe had evaporated was what seemed to escape those who welcomed Darwin as a benefactor of mankind. Nietzsche considered that evolution presented a correct picture of the world, but that it was a disastrous picture. His philosophy was an attempt to produce a new world-picture which took Darwinism into account but was not nullified by it.