“All our ideas are representations of the objects that affect our senses; then what can be represented by the idea of God, which is obviously an idea without an object? Isn't such an idea, or will add, as impossible as effects without causes? Isn't an idea without a prototype anything but a chimera? Some Doctors of the Church, you will continue, assure us that the notion of God is innate, and that a man already has this notion in his mother's womb. But that is wrong, you will add; every principle is a judgement, every judgement is the result of experience, and experience can be gained only through the exercise of the senses. And it thereby follows that religious principles are obviously based on nothing and are not innate at all. How, you will go on, could anyone persuade rational beings that the hardest thing to grasp was the most essential thing for them? They were terrified; and when you are terrified, you are no longer rational. Above all, they were told to distrust their reasoning; and when the brains are muddled, you believe everything and examine nothing. Fear and ignorance, you will continue, are two mainstays of any and all religions.”

Yet Another Effort, Frenchmen, If You Would Become Republicans
Philosophy in the Bedroom (1795)