This paper reconstructs and analyzes Slavoj Žižek's notion of "Christian atheism," according to which Christianity, properly understood, is not a metaphysical doctrine about a transcendent God, but the narrative matrix in which the death of God and the non-existence of any ultimate guarantor of meaning are fully acknowledged. Žižek explicitly starts from the Enlightenment's classical critique of religion (Feuerbach, Marx), which, for him, has definitively refuted the existence of a metaphysical, transcendent God: there is no big Other. This atheistic insight is the positive presupposition of his project, not its result.