William Lane Craig offers some thoughts at YouTube:
Man, writes Loren Eiseley, is the Cosmic Orphan. He is the only creature in the universe who asks, “Why?” Other animals have instincts to guide them, but man has learned to ask questions. “Who am I?” man asks. “Why am I here? Where am I going?” Since the Enlightenment, when he threw off the shackles of religion, man has tried to answer these questions without reference to God. But the answers that came back were not exhilarating, but dark and terrible. “You are the accidental by-product of nature, a result of matter plus time plus chance. There is no reason for your existence. All you face is death.”
Modern man thought that when he had gotten rid of God, he had freed himself from all that repressed and stifled him. Instead, he discovered that in killing God, he had also killed himself. For if there is no God, then man’s life becomes absurd. More.
Note: Eiseley (1907-1977) was the author of Darwin’s Century and the Men Who Discovered It
See also: William Lane Craig takes on Adam and Eve