‘As many critics of religion have pointed out, the notion of a creator poses an immediate problem of an infinite regress. If God created the universe, what created God? To say that God, by definition, is uncreated simply begs the question. Any being capable of creating a complex world promises to be very complex himself. As the biologist Richard Dawkins has observed repeatedly, the only natural process we know of that could produce a being capable of designing things is evolution.
The truth is that no one knows how or why the universe came into being. It is not clear that we can even speak coherently about the creation of the universe, given that such an event can be conceived only with reference to time, and here we are talking about the birth of space-time itself.
 The physicist Stephen Hawking, for instance, pictures space-time as a four dimensional, closed manifold, without beginning or end (much like the surface of a sphere).
Any intellectually honest person will admit that he does not know why the universe exists. Scientists, of course, readily admit their ignorance on this point. Religious believers do not. One of the monumental ironies of religious discourse can be appreciated in the frequency with which people of faith praise themselves for their humility, while condemning scientists and other non-believers for their intellectual arrogance. There is, in fact, no worldview more reprehensible in its arrogance than that of a religious believer: the creator of the universe takes an interest in me, approves of me, loves me, and will reward me after death; my current beliefs, drawn from scripture, will remain the best statement of the truth until the end of the world; everyone who disagrees with me will spend eternity in hell. …
An average Christian, in an average church, listening to an average Sunday sermon has achieved a level of arrogance simply unimaginable in scientific discourse—and there have been some extraordinarily arrogant scientists.
Over 99 percent of the species that ever walked, flew, or slithered upon this earth are now extinct. This fact alone appears to rule out intelligent design. When we look at the natural world, we see extraordinary complexity, but we do not see optimal design. We see redundancy, regressions, and unnecessary complications; we see bewildering inefficiencies that result in suffering and death. We see flightless birds and snakes with pelvises. We see species of fish, salamanders, and crustaceans that have nonfunctional eyes, because they continued to evolve in darkness for millions of years. We see whales that produce teeth during fetal development, only to reabsorb them as adults. Such features of our world are utterly mysterious if God created all species of life on earth “intelligently”; none of them are perplexing in light of evolution.’
– Harris. S. 2006. Letter To A Christian Nation p. 24