The secular picture, meanwhile, seems to have the rigor of the scientific method behind it. But it actually suffers from a deeper intellectual incoherence than either of its rivals, because its cosmology does not harmonize at all with its moral picture.
In essence, it proposes a purely physical and purposeless universe, inhabited by evolutionary accidents whose sense of self is probably illusory. And yet it then continues to insist on moral and political absolutes with all the vigor of a 17th-century New England preacher. And the rope bridges flung across this chasm — the scientific-sounding logic of utilitarianism, the Darwinian justifications for altruism — tend to waft, gently, into a logical abyss.