According to Oxford Languages, nihilism is "the rejection of all religious and moral principles, and the belief that life is meaningless." I have found that atheistic skepticism and positivism often ends in nihilism. Nietzsche understood this better than any other philosopher of his day. After being influenced by the nihilism of Schopenhauer, Nietzsche spent his entire career reacting against the No-saying of Schopenhauer with a more positive Yes-saying philosophy of life. Nietzsche acted as a "physician of the soul" diagnosing the sickness of modern culture due to nihilism and presenting the cure of a path to the Great Health.
For Nietzsche, nihilism need not affect one's psychology and physiology negatively if they instead follow his existential "cure" of affirming life and the human species. For Nietzsche, scientific veracity was not as important as was "how far an opinion is life-furthering, life-preserving, species-preserving, perhaps species-rearing" (Source). So whatever affirmed life and the species was good, even religion-making was good as long as the religious mythology did not negate life or deny life but affirmed organic life and becoming. Thus, in Human, All Too Human -- Section Five: Signs of Higher and Lower Culture - Aphorism # 251, Nietzsche writes, "if science produces ever less joy in itself and takes ever greater joy in casting suspicion on the comforts of metaphysics, religion, and art, then the greatest source of pleasure, to which mankind owes almost its whole humanity, is impoverished. Therefore a higher culture must give give man a double brain, two brain chambers, as it were, one to experience science, and one to experience nonscience. Lying next to one another, without confusion, separable, self-contained: our health demands this. In the one domain lies the source of strength, in the other the regulator. Illusions, biases, passions must give heat; with the help of scientific knowledge, ..." In short, Nietzsche diagnosed nihilism as an existential sickness and offered the cure of the great health through religion-making artistry, which our health demands.
Nietzsche distinguished between active and passive nihilism, writing in his notes in The Will to Power:
“Nihilism, a normal condition.
It may be a sign of strength; spiritual vigour may have increased to such an extent that the goals toward which man has marched hitherto (the "convictions," articles of faith) are no longer suited to it (for a faith generally expresses the exigencies of the conditions of existence, a submission to the authority of an order of things which conduces to the prosperity, the growth and power of a living creature ...); on the other hand, a sign of insufficient strength, to fix a goal, a "wherefore," and a faith for itself.
It reaches its maximum of relative strength, as a powerful destructive force, in the form of active Nihilism.
Its opposite would be weary Nihilism, which no longer attacks: its most renowned form being Buddhism: as passive Nihilism, a sign of weakness: spiritual strength may be fatigued, exhausted, so that the goals and values which have prevailed hitherto are no longer suited to it and are no longer believed in—so that the synthesis of values and goals (upon which every strong culture stands) [Pg 22]decomposes, and the different values contend with one another: Disintegration, then everything which is relieving, which heals, becalms, or stupefies, steps into the foreground under the cover of various disguises, either religious, moral, political or æsthetic, etc.”
In other words, even if one arrives at nihilism after the death of the God-concept by science, the psychological disorientation of the Mad Man (below) in Nietzsche's parable is real and his remedy of religion-making becomes an option to overcome the disorienting sickness of nihilism:
The madman jumped into their midst and pierced them with his eyes. "Whither is God?" he cried; "I will tell you. We have killed him -- you and I. All of us are his murderers. But how did we do this? How could we drink up the sea? Who gave us the sponge to wipe away the entire horizon? What were we doing when we unchained this earth from its sun? Whither is it moving now? Whither are we moving? Away from all suns? Are we not plunging continually? Backward, sideward, forward, in all directions? Is there still any up or down? Are we not straying, as through an infinite nothing? Do we not feel the breath of empty space? Has it not become colder? Is not night continually closing in on us? Do we not need to light lanterns in the morning? Do we hear nothing as yet of the noise of the gravediggers who are burying God? Do we smell nothing as yet of the divine decomposition? Gods, too, decompose. God is dead. God remains dead. And we have killed him.
"Is not the greatness of this deed [killing the God-concept] too great for us? Must we ourselves not become gods simply to appear worthy of it? There has never been a greater deed; and whoever is born after us -- for the sake of this deed he will belong to a higher history than all history hitherto."
How one responds to nihilism can either be life-affirming and psychologically healthy by integrating both the left and right brain so to speak (i.e. Logos and Mythos); in order to ignite the passions through the imagination; or one's response can be pessimistic and life negating, denying the passions and imagination, thus lacking art, creativity, and mystical heat: as with Buddhism or Schopenhauerianism, etc.
Nietzsche emphasizes the body (or one's physiology) above all else and how what we think and believe affects our body or physiology. So for Nietzsche there were two trajectories: shrinking in vitality and valor toward a degenerated, weak, pessimistic pale atheist and mediocre person (i.e. a Last Man), or expanding through courage, valor and optimistic myth-making toward generative strength and vitality (i.e. a Higher Man).
Click on the image below where I present a Nietzschean Trajectory:
So I would argue that from a Nietzschean perspective, regardless of its objective veracity, "Smith-Pratt Mormonism" acts as dramatic art form and cultural ethos that is more life-affirming, hero's journey affirming, existentially healthy, and generative toward high culture and The Great Health, than the alternative of atheistic relativism and passive nihilism that leads to physiological depressiveness and cultural degeneration.
A Case Study:
Compare the images below:
The actor Matthew McConaughey embodying the philosophical pessimism of the character Russ Chole: