From the many writers who exemplify the same point in a different way, I shall select Evelyn Waugh, who was of the same faith as Bishop Butler, and who did his best in his fiction to argue for the operations of divine grace. In his novel Brideshead Revisited he makes a very acute observation. The two protagonists, Sebastian Flyte and Charles Ryder, the first of whom is heir to an old Catholic nobility, are visited by Father Phipps, who believes that all young men must be passionately interested in cricket. When disabused of this notion, he looks at Charles «with the expression I have seen since in the religious, of innocent wonder that those who expose themselves to the dangers of the world should avail themselves so little of its varied solace».

Thus I rescrutinize Bishop Butler’s question. Was he in fact not telling Ayer, in his own naive way, that if freed from the restraints of doctrine he himself would choose to lead «a life of unbridled immorality»? One naturally hopes not. But much empirical evidence exists to reinforce the suggestion. When priests go bad, they go very bad indeed, and commit crimes that would make the average sinner pale. One might prefer to attribute this to sexual repression than to the actual doctrines preached, but then one of the actual doctrines preached is sexual repression… Thus the connection is unavoidable, and a litany of folkloric jokes have been told by all lay members of the church ever since religion began.

Waugh’s own life was far more stained by offenses against chastity and sobriety than was the life of Ayer (only it seemed to bring less happiness to the former than to the latter), and in consequence he was often asked how he reconciled his private conduct with his public beliefs. His reply has become celebrated: he asked his friends to imagine how much worse he would be if he were not a Catholic. For a believer in original sin this might have served as a turning of the tables, but any examination of Waugh’s actual life shows that its most wicked elements arose precisely from his faith. Never mind the sad excesses of drunkenness and marital infidelity: he once sent a wedding telegram to a divorced and now remarried friend telling her that her nuptial night would increase the loneliness of Calvary and add to the spittle on the face of Christ. He supported fascist movements in Spain and Croatia, and Mussolini’s foul invasion of Abyssinia, because they enjoyed the support of the Vatican, and he wrote in 1944 that only the Third Reich now stood between Europe and barbarism. These deformities in one of my most beloved authors arose not in spite of his faith, but because of it. No doubt there were private acts of charity and contrition, but these could equally well have been performed by a person of no faith at all. To look no further than the United States, the great Colonel Robert Ingersoll, who was the nation’s leading advocate of unbelief until his death in 1899, maddened his opponents because he was a person of immense generosity, a loving and constant husband and father, a gallant officer, and the possessor of what Thomas Edison with pardonable exaggeration called «all the attributes of a perfect man».

In my own recent life in Washington, I have been bombarded with obscene and menacing phone calls from Muslims, promising to punish my family because I do not support a campaign of lies and hatred and violence against democratic Denmark. But when my wife accidentally left a large amount of cash on the backseat of a taxi, the Sudanese cab driver went to a good deal of trouble and expense to work out whose property this was, and to drive all the way to my home to return it untouched. When I made the vulgar mistake of offering him 10 percent of the money, he made it quietly but firmly plain that he expected no recompense for performing his Islamic duty. Which of these two versions of faith is the one to rely upon?

The question is in some ways ultimately undecidable. I would prefer to have Evelyn Waugh’s shelf of writing just as it is, and to appreciate that one cannot have the novels without the torments and evils of its author. And if all Muslims conducted themselves like the man who gave up more than a week’s salary in order to do the right thing, I could be quite indifferent to the weird exhortations of the Koran. If I search my own life for instances of good or fine behavior I am not overwhelmed by an excess of choice. I did once, shivering with fear, take off my flak jacket in Sarajevo and lend it to an even more frightened woman who I was helping escort to a place of safety (I am not the only one who has been an atheist in a foxhole). I felt at the time that it was the least I could do for her, as well as the most. The people shelling and sniping were Serbian Christians, but then, so was she.

In northern Uganda in late 2005, I sat in a center for the rehabilitation of kidnapped and enslaved children in the land of the Acholi people who live on the northern side of the Nile. The listless, vacant, hardened little boys (and some girls) were all around me. Their stories were distressingly similar. They had been seized, at the age of anything from eight to thirteen, from their schools or homes by a stone-faced militia that was itself originally made up of abducted children. Marched into the bush, they were «initiated» into the force by one (or two) of two methods. They either had to take part in a murder themselves, in order to feel «dirtied up» and implicated, or they had to submit to a prolonged and savage whipping, often of up to three hundred strokes. («Children who have felt cruelty,» said one of the elders of the Acholi people, «know very well how to inflict it».) The misery inflicted by this army of wretches turned zombies was almost beyond computation. It had razed villages, created a vast refugee population, committed hideous crimes such as mutilation and disemboweling, and (in a special touch of evil) had continued to kidnap children so that the Acholi were wary of taking strong countermeasures lest they kill or injure one of their «own».

The name of the militia was the «Lord’s Resistance Army» (LRA), and it was led by a man named Joseph Kony, a passionate former altar boy who wanted to subject the area to the rule of the Ten Commandments. He baptized by oil and water, held fierce ceremonies of punishment and purification, and insured his followers against death. His was a fanatical preachment of Christianity. As it happened, the rehabilitation center in which I was sitting was also run by a fundamentalist Christian organization. Having been out into the bush and seen the work of the LRA, I fell to talking with the man who tried to repair the damage. How did he know, I asked him, which of them was the truest believer? Any secular or state-run outfit could be doing what he was doing — fitting prosthetic limbs and providing shelter and «counseling» — but in order to be Joseph Kony one had to have real faith.

To my surprise, he did not dismiss my question. It was true, he said, that Kony’s authority arose in part from his background in a priestly Christian family. It was also true that people were apt to believe he could work miracles, by appealing to the spirit world and promising his acolytes that they were death-proof. Even some of those who had run away would still swear that they had seen wonders performed by the man. All that a missionary could do was to try and show people a different face of Christianity.

I was impressed by this man’s frankness. There were some other defenses that he might have offered. Joseph Kony is obviously far away from the Christian «mainstream». For one thing, his paymasters and armorers are the cynical Muslims of the Sudanese regime, who use him to make trouble for the government of Uganda, which has in turn supported rebel groups in Sudan. In an apparent reward for this support, Kony at one stage began denouncing the keeping and eating of pigs, which, unless he has become a fundamentalist Jew in his old age, suggests a payoff to his bosses. These Sudanese murderers, in their turn, have for years been conducting a war of extermination not just against the Christians and animists of southern Sudan, but against the non-Arab Muslims of Darfur province. Islam may officially make no distinction between races and nations, but the slaughterers in Darfur are Arab Muslims and their victims are African Muslims. The «Lord’s Resistance Army» is nothing but a Christian Khmer Rouge sideshow in this more general horror.