The life of the unbeliever is riddled with such inconsistency. He will presuppose human dignity and attend a funeral to honor a dead friend or relative, even though he previously argued that man is, in principle, no different from any other product of evolution like a horse or dog. The unbeliever will insist that man is nothing more than a complex of bio-chemical factors controlled by the laws of physics—and then kiss his wife and children when he goes home, as though they share love with each other. He will argue than in sexual relations “anything goes” (there are no moral absolutes)—but then indignantly condemn child molesters or morally repudiate necrophilia. He will suggest that the things which happen in the universe happen randomly—by “chance”—but then turn around and look for regularities, law-like explanations of events, and uniformity or predictability in the things studied by natural science. The non-Christian does not have a workable worldview, and he exposes its weakness at every turn in his life.
–Greg L. Bahnsen