Our species will never run out of fools but I dare say that there have been at least as many credulous idiots who professed faith in god as there have been dolts and simpletons who concluded otherwise. It might be immodest to suggest that the odds rather favor the intelligence and curiosity of the atheists, but it is the case that some humans have always noticed the improbability of god, the evil done in his name, the likelihood that he is man-made, and the availability of less harmful alternative beliefs and explanations. We cannot know the names of all these men and women, because they have in all times and all places been subject to ruthless suppression. For the identical reason, nor can we know how many ostensibly devout people were secretly unbelievers. As late as the eighteenth and nineteenth centuries, in relatively free societies such as Britain and the United States, unbelievers as secure and prosperous as James Mill and Benjamin Franklin felt it advisable to keep their opinions private. Thus, when we read of the glories of «Christian» devotional painting and architecture, or «Islamic» astronomy and medicine, we are talking about advances of civilization and culture — some of them anticipated by Aztecs and Chinese — that have as much to do with «faith» as their predecessors had to do with human sacrifice and imperialism. And we have no means of knowing, except in a very few special cases, how many of these architects and painters and scientists were preserving their innermost thoughts from the scrutiny of the godly. Galileo might have been unmolested in his telescopic work if he had not been so unwise as to admit that it had cosmological implications.
Doubt, skepticism, and outright unbelief have always taken the same essential form as they do today. There were always observations on the natural order which took notice of the absence or needlessness of a prime mover. There were always shrewd comments on the way in which religion reflected human wishes or human designs. It was never that difficult to see that religion was a cause of hatred and conflict, and that its maintenance depended upon ignorance and superstition. Satirists and poets, as well as philosophers and men of science, were capable of pointing out that if triangles had gods their gods would have three sides, just as Thracian gods had blond hair and blue eyes.
The original collision between our reasoning faculties and any form of organized faith, though it must have occurred before in the minds of many, is probably exemplified in the trial of Socrates in 399 BC. It does not matter at all to me that we have no absolute certainty that Socrates even existed. The records of his life and his words are secondhand, almost but not quite as much as are the books of the Jewish and Christian Bible and the hadiths of Islam. Philosophy, however, has no need of such demonstrations, because it does not deal in «revealed» wisdom. As it happens, we have some plausible accounts of the life in question (a stoic soldier somewhat resembling Schweik in appearance; a shrewish wife; a tendency to attacks of catalepsy), and these will do. On the word of Plato, who was perhaps an eyewitness, we may accept that during a time of paranoia and tyranny in Athens, Socrates was indicted for godlessness and knew his life to be forfeit. The noble words of the Apology also make it plain that he did not care to save himself by affirming, like a later man faced with an inquisition, anything that he did not believe. Even though he was not in fact an atheist, he was quite correctly considered unsound for his advocacy of free thought and unrestricted inquiry, and his refusal to give assent to any dogma. All he really «knew», he said, was the extent of his own ignorance. (This to me is still the definition of an educated person.) According to Plato, this great Athenian was quite content to observe the customary rites of the city, testified that the Delphic oracle had instructed him to become a philosopher, and on his deathbed, condemned to swallow the hemlock, spoke of a possible afterlife in which those who had thrown off the world by mental exercise might yet continue to lead an existence of pure mind. But even then, he remembered as always to qualify himself by adding that this might well not be the case. The question, as always, was worth pursuing. Philosophy begins where religion ends, just as by analogy chemistry begins where alchemy runs out, and astonomy takes the place of astrology.
From Socrates, also, we can learn how to argue two things that are of the highest importance. The first is that conscience is innate. The second is that the dogmatic faithful can easily be outpointed and satirized by one who pretends to take their preachings at face value.
Socrates believed that he had a daimon, or oracle, or internal guide, whose good opinion was worth having. Everybody but the psychopath has this feeling to a greater or lesser extent. Adam Smith described a permanent partner in an inaudible conversation, who acted as a check and scrutineer. Sigmund Freud wrote that the voice of reason was small, but very persistent. C. S. Lewis tried to prove too much by opining that the presence of a conscience indicated the divine spark. Modern vernacular describes conscience — not too badly — as whatever it is that makes us behave well when nobody is looking. At any event, Socrates absolutely refused to say anything of which he was not morally sure. He would sometimes, if he suspected himself of casuistry or crowd-pleasing, break off in the very middle of a speech. He told his judges that at no point in his closing plea had his «oracle» hinted at him to stop. Those who believe that the existence of conscience is a proof of a godly design are advancing an argument that simply cannot be disproved because there is no evidence for or against it. The case of Socrates, however, demonstrates that men and women of real conscience will often have to assert it against faith.
He was facing death but had the option, even if convicted, of a lesser sentence if he chose to plead for it. In almost insulting tones, he offered to pay a negligible fine instead. Having thus given his angry judges no alternative but the supreme penalty, he proceeded to explain why murder at their hands was meaningless to him. Death had no terror: it was either perpetual rest or the chance of immortality — and even of communion with great Greeks like Orpheus and Homer who had predeceased him. In such a happy case, he observed drily, one might even wish to die and die again. It need not matter to us that the Delphic oracle is no more, and that Orpheus and Homer are mythical. The point is that Socrates was mocking his accusers in their own terms, saying in effect: I do not know for certain about death and the gods — but I am as certain as I can be that you do not know, either.
Some of the antireligious effect of Socrates and his gentle but relentless questioning can be gauged from a play that was written and performed in his own lifetime. The Clouds, composed by Aristophanes, features a philosopher named Socrates who keeps up a school of skepticism. A nearby farmer manages to come up with all the usual dull questions asked by the faithful. For one thing, if there is no Zeus, who brings the rain to water the crops? Inviting the man to use his head for a second, Socrates points out that if Zeus could make it rain, there would or could be rain from cloudless skies. Since this does not happen, it might be wiser to conclude that the clouds are the cause of the rainfall. All right then, says the farmer, who moves the clouds into position? That must surely be Zeus. Not so, says Socrates, who explains about winds and heat. Well in that case, replies the old rustic, where does the lightning come from, to punish liars and other wrongdoers? The lightning, it is gently pointed out to him, does not seem to discriminate between the just and the unjust. Indeed, it has often been noticed to strike the temples of Olympian Zeus himself. This is enough to win the farmer over, though he later recants his impiety and burns down the school with Socrates inside it. Many are the freethinkers who have gone the same way, or escaped very narrowly. All major confrontations over the right to free thought, free speech, and free inquiry have taken the same form — of a religious attempt to assert the literal and limited mind over the ironic and inquiring one.