Book 4, chapter 8, of the Social Contract, on civil religion, presents a puzzle. According to Rousseau, no state has ever been founded that did not have religion as its base. But which religion? Christianity is not an option. Paganism is not an option. Monotheistic theocracy is not an option. What does that leave? By a process of elimination, we are left with an Enlightenment religion of tolerance and mutual forbearance, which even readers sympathetic to Rousseau (or perhaps especially readers sympathetic to Rousseau) might say is no religion at all. I argue that Machiavelli and Hobbes share Rousseau's fundamental concern, which is that the otherworldly aspirations of Christianity are subversive of political requirements, but each of them thinks he can solve the problem by “de-transcendentalizing” Christianity: Machiavelli, by treating the papacy as if it were a pagan institution; Hobbes, by reinterpreting the New Testament as if it were the Old Testament. The article examines why Rousseau rejects the Machiavellian and Hobbesian solutions to his problem, and why he has no solution of his own to offer.