Absence of God entails the absence of any fixed human nature.

Evidence

We mean that man first of all exists, encounters himself, surges up in the world – and defines himself afterwards. If man as the existentialist sees him is not definable, it is because to begin with he is nothing. He will not be anything until later, and then he will be what he makes of himself. Thus, there is no human nature, because there is no God to have a conception of it. Man simply is. — Jean-Paul Sartre, Existentialism Is a Humanism, 10

Categorization

• DEFINE: Spells out the causal chain from atheism to the rejection of a fixed human nature.
• XREF: connects to: Humans lack any predefined nature and create themselves through choices — Sarah Bakewell, At the Existentialist Café: Freedom,…, 26; Humans are blind to their own lack of an original fixed nature; The absence of divine design obliges us to act without hoping for cosmic outcomes — Jean-Paul Sartre, Existentialism Is a Humanism, 16

Related

• Humans lack any predefined nature and create themselves through choices (similarity 0.86)
• Humans are blind to their own lack of an original fixed nature (similarity 0.82)
• The absence of divine design obliges us to act without hoping for cosmic outcomes (similarity 0.81)
• Human reality is constituted as the unique foundation of nothingness within being. (similarity 0.80)
• Human reality is an abortive project toward being its own self-cause (similarity 0.80)
• Human beings create their own essence through action rather than inheriting a fixed nature (similarity 0.80)
• Human reality arises as a lack of an impossible self-totality (similarity 0.80)
• Every human being fundamentally desires to be God, a desire that is inherently self-contradictory. (similarity 0.80)
• God is the hypostasized ideal of the impossible self-synthesis (similarity 0.80)
• Human reality creates place yet receives its own place without choice (similarity 0.80)
• Every act emanates from a fundamental choice of being God (similarity 0.79)
• Human desire fundamentally aims at being one’s own foundation, a state called God. (similarity 0.79)
• The humanistic Us-object is an unattainable ideal demanding the correlative concept of God (similarity 0.79)
• All human projects aim at becoming God through self-causation (similarity 0.78)
• Existentialist ethics demand acting as if the fate of humanity rests on each choice (similarity 0.78)

Broader Connections

• Humans lack any predefined nature and create themselves through choices #expands (0.95) — Sarah Bakewell, At the Existentialist Café, 26
• Humans are blind to their own lack of an original fixed nature #expands (0.85)
• The absence of divine design obliges us to act without hoping for cosmic outcomes #expands (0.80) — Jean-Paul Sartre, Existentialism Is a Humanism, 16