Sartre’s atheism was more thoroughgoing than Heidegger’s or even Nietzsche’s.

Evidence

Sartre was a profound atheist, and a humanist to his bones. He outdid even Nietzsche in his ability to live courageously and thoughtfully in the conviction that nothing lies beyond, and that no divine compensations will ever make up for anything on this earth. For him, this life is what we have, and we must make of it what we can. — Sarah Bakewell, At the Existentialist Café, 1017

Categorization

• DEFINE: Clarifies what Sartre’s radical atheism and humanism actually meant in practice versus Heidegger’s mysticism-adjacent faith abandonment.
• XREF: connects to: Sartre’s atheism rejects specifically the Scholastic creator-God.; Sartre bridged generations of students back to Nietzsche and Kierkegaard. — Sarah Bakewell, At the Existentialist Café: Freedom,…, 75; Sartre saw philosophy as lacking a genuinely atheist system and aimed to supply it. — Sarah Bakewell, At the Existentialist Café: Freedom,…, 1018