THE UNCAUSED CAUSE
When it comes to the scope of our universe, there are only two positions regarding its size and duration. It is either finite or infinite. Modern discoveries in astronomy and physics indicate that our universe had a beginning and, though expanding (actually, because it is expanding), has a boundary. Furthermore, its entropic nature indicates that our universe will have an end, thus a limit to its expansion and so a limit to its expanse. Scientific observation alone argues for a universe that is bounded in both space and time.
Nevertheless, many atheists have a philosophical objection to a finite universe. That is because a finite universe, like all finite things, must have been caused. Therefore, if our universe were finite, it had a cause. What would be the cause of that cause? Of course, the Christian answers, “God.” But the atheist retorts that God would then be an uncaused cause, a contradiction. To resolve what he perceives as a contradiction, the atheist concludes that our universe is, in some manner or another, infinite in both time and space. To accord with what science has informed us about the scope of our universe, the atheist may argue that only the current form of the universe is finite or that finite portions (like ours) of the infinite universe are in different states of evolution or that our universe is but a bubble in an infinite multiverse.
However, does the atheist’s infinite universe actually resolve his problem with the uncaused cause? No, it doesn’t. All the atheist has accomplished by attributing infinity to the universe is to make the universe itself uncaused. To wit, if the universe is eternal then it can have no cause, because that which has always existed cannot have been caused to come into existence. Thus, the problem of the uncaused cause remains. However, the atheist is now confronted with a genuine contradiction in making our universe the uncaused cause. One thing we are certain about our universe is that everything that composes it has been caused. Our universe is ruthlessly mechanical as determined by the laws of nature (at least in regard to its physical elements), yet the atheist who posits that the universe is infinite must deny the universality of causality, at least in extremis. Hence a contradiction: The universe is causal except that which must be acausal to accord with its infinity, which in effect means everything. (Click here for an article on this and other intractable problems raised by an infinite universe.)
The Christian avoids the atheist’s dilemma by acknowledging that our universe is finite and recognizing that its cause is external to it. That external cause, a creator which by definition must be greater than its creation, is not subject to the limitations we observe within our universe. That external cause therefore can be understood to not be caused in any sense that we understand everything within the universe, and indeed the universe itself, to be caused. Thus, the Christian not only comprehends our universe, including its origin, to be entirely consistent with the laws of nature which govern it, but also that its creator – i.e., God – is apart from and beyond it. Like all creators, God is not bound by his creation. Just as my nature, as a manufacturer, is wholly distinct from and profoundly superior to the products I create, so is God's nature in relation to His creation, our universe.
In this way, the Christian does not confuse the realm of the natural with that of the supernatural. However, the atheist who embraces an infinite universe must confound the two to accept both the causality that we presently observe of the universe with the lack of causality in its essence.