Atheism requires believing that life has no objective meaning, morality is not binding, love is chemistry, death is permanent annihilation, and everything will be as though it never existed. Nietzsche, Sartre, and Camus were honest about this. Most atheists do not live by these conclusions — they live as practical theists while holding theoretical atheism.
Key claims
—Russell: "Brief and powerless is Man's life; on him and all his race the slow, sure doom falls pitiless and dark"
—Nietzsche: the Übermensch response is elitist, psychologically unsustainable, and logically circular
—Sartre: "existence precedes essence" — we create meaning — but on what basis is any choice better than any other?
—Camus: "There is but one truly serious philosophical problem, and that is suicide"
—Most atheists live as practical theists: they act as though love is real, dignity is binding, and justice matters
—Lewis: "What was I comparing this universe with when I called it unjust?" — moral outrage presupposes a standard atheism cannot provide
The arguments in the preceding sections address what atheism cannot explain. This section addresses what atheism requires a person to believe — what it costs to hold atheism consistently, to live by what it actually implies rather than what it claims while borrowing from a framework it has officially rejected.
⸻
What atheism actually entails
If atheism is true — if the universe is purely physical, if no God exists, if consciousness is an accidental byproduct of matter in motion — then a series of conclusions follow that very few atheists are willing to fully embrace:
There is no objective meaning. The universe did not intend you to exist. Your existence is an accident — the product of a cosmic history that had no goal, no purpose, and no interest in producing conscious beings. Your life has no intrinsic significance that the universe recognizes or cares about.
There is no objective morality. As established in Section 04, on a purely physical account, moral values are either evolutionary adaptations (and therefore not binding), social agreements (and therefore contingent), or arbitrary preferences (and therefore not objective). Nothing is actually wrong.
Love is chemistry. The love you feel for another person is a particular pattern of neurochemical activity — oxytocin, dopamine, serotonin — produced by evolutionary mechanisms that enhanced pair bonding and parental investment. The sense that this love is significant, irreplaceable, and real in a way that transcends its physical substrate is, on this account, an illusion.
Death is annihilation. When you die, you cease entirely. Every relationship you built, every meaning you constructed, every value you affirmed dissolves. Your consciousness — the only thing through which you have ever experienced anything — ends permanently and completely.
Everything will be as though it never existed. In approximately 5 billion years, the sun will expand and incinerate the earth. In approximately 10^100 years, the last black holes will evaporate. The universe will reach heat death — a state of maximum entropy and minimum energy from which no further change is possible. Nothing that was ever done, thought, loved, created, or suffered will persist. The total record of human experience will be erased without remainder.
Bertrand Russell — one of the 20th century's greatest philosophers and a committed atheist — stated this conclusion without flinching:
Brief and powerless is Man's life; on him and all his race the slow, sure doom falls pitiless and dark. Blind to good and evil, reckless of destruction, omnipotent matter rolls on its relentless way; for Man, condemned today to lose his dearest, tomorrow himself to pass through the gate of darkness, it remains only to cherish, ere yet the blow falls, the lofty thoughts that ennoble his little day; to worship at the shrine his own hands have built; undismayed by the empire of chance, to preserve a mind free from the wanton tyranny that rules his outward life.
Russell was a great prose stylist, and there is something genuinely heroic about his defiant "free man's worship" in the face of cosmic indifference. But heroism does not make the underlying account true. And the account, taken seriously, is one of comprehensive and irreversible meaninglessness.
⸻
Nietzsche, Sartre, and Camus: the honest atheist tradition
The most intellectually serious atheists have recognized what their worldview requires and have attempted to respond honestly to it. Each of their responses, examined carefully, fails.
Nietzsche's Übermensch: Nietzsche recognized that the death of God destroys the objective value framework within which Western civilization had operated. His response was the Übermensch — the person who creates their own values from strength and will, who imposes meaning on a meaningless cosmos through sheer force of self-assertion. This is a dramatic and powerful image. It is also elitist (only the few can sustain it), psychologically demanding to the point of impossibility (Nietzsche himself collapsed), and logically circular (if there are no objective values, on what basis is self-creation preferable to self-destruction?).
Sartre's existentialism: Jean-Paul Sartre concluded from atheism that "existence precedes essence" — that human beings have no pre-given nature or purpose, and must create their own meaning through their choices. "Man is condemned to be free," Sartre wrote. This is a genuine philosophical response to nihilism. But it faces the same circularity as Nietzsche's: if no choices are objectively better than others, on what basis do I commit to any choice? Sartre's answer — commitment, engagement, authenticity — borrows normative force (the sense that some ways of living are better) that his own framework cannot supply.
Camus's absurdism: Albert Camus acknowledged that the universe is silent — it offers no answers to human questions about meaning — and called the tension between human longing for meaning and the universe's silence "the absurd." His response was to embrace the absurd with defiant joy — to live fully and passionately in the face of meaninglessness, like Sisyphus rolling his boulder and finding happiness in the rolling.
Camus's is perhaps the most aesthetically attractive atheist response to nihilism. But it requires a willed self-deception: deciding to act as though things matter while knowing, on one's own account, that they do not. Camus himself acknowledged this was not a philosophical solution but an existential posture — a way of living in the problem without resolving it.
There is but one truly serious philosophical problem, and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy.
Camus is not advocating suicide. He is recognizing that, on an atheistic account of reality, suicide is the honest question — the question that must be answered before any other philosophical question can proceed. The fact that most atheists do not ask this question, do not feel its urgency, and live their lives as though meaning is real and love matters and justice is binding — is itself evidence that atheism is not the account of reality they actually operate from.
⸻
The self-contradiction of practical atheism
Most atheists, in practice, live as though their lives matter. They love their children with a devotion that feels absolute, not contingent. They respond to injustice with moral outrage that feels binding, not optional. They create art, pursue knowledge, and build relationships as though these activities have significance that transcends their temporary existence. They live, in other words, as though the world has the character that Christianity says it has — as though human beings have inherent dignity, as though love is real, as though truth and beauty matter.
This is not a criticism of atheists as persons. Most atheists are morally serious, loving, and courageous people. The observation is about their worldview: they do not actually live by what their worldview says. They live by a moral and existential intuition — the sense that persons matter, that love is real, that justice is binding — that their own framework cannot ground.
C.S. Lewis recognized this pattern in his own pre-conversion experience:
My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. What was I comparing this universe with when I called it unjust? If the whole show was bad and senseless from A to Z, so to speak, why did I, who was supposed to be part of the show, find myself in such violent reaction against it?
Lewis's moral outrage at the injustice of the universe presupposed a moral standard — a conception of how things ought to be that transcended the way things are. That standard, he realized, required a source beyond the universe. The atheist who finds the world unjust, cruel, or meaningless is, in that very act of moral judgment, reaching for a framework that atheism cannot provide.