Bayle passed boldly to one of the most difficult problems of history: Is a natural ethic possible—can a moral code be maintained without the aid of supernatural belief? Did atheism lead to corrupt morals? If that were so, said Bayle, one would have to conclude, from the crime, corruption, and immorality prevalent in Europe, that most Christians are secret atheists. Jews, Mohammedans, Christians, and infidels differ in creeds, but not in deeds.