To your prescient point, those that buy the lie of modernity that is unfettered rationality and the arrogance of atheism may find their own long haul moral foundation and framework lacking. Hell, even the mighty Nietzsche hisownself could not rise to the lofty heights of his conceptual Übermensch after proclaiming that God is dead (And we killed him. And there would never be enough water to wash the blood from our hands). Instead, he sank into a madness of the detached bliss of stupor.