Understanding the rationality of faith is no replacement for faith itself, but it is nonetheless an important part of our relationship with God. Let’s remember that the Gospel of John identifies Jesus as the Word “who was with God and was God.” The term “Word” is a translation into English of the Greek word Logos, which carries with it a range of meanings, all of which imply reason, rationality, order, understandable communication. If Jesus is the expression of the nature and thought of God, then the fact that He is “the Word” incarnate suggests that our faith is rational. Even if the grandeur and scope of our faith transcends the limits of human reason, we still recognize that belief in God is logical. This was certainly the case for the earliest Fathers of the Church, who understood the importance of right reason in the service of our faith. They often speak of our experience of Christ as fides quaestio intellectum — “faith in search of understanding.”
Even in scripture we find suggestions that faith is not contrary to rationality. The Apostle Paul tells us, in Romans 1, to which people often look for his great discussion of justification by faith, that “what can be known about God” is plain to human beings. There he states clearly, “Since the creation of the world, God’s invisible qualities — his eternal nature and divine qualities — have been clearly seen, being understood from what has been made, so that men are without excuse.” He seems to be telling us that the very existence and nature of the universe reveal thingsrationally to us about God to us.
That does not mean, however, that all people will believe. Faith involves a choice to believe the Gospel; but the choice of faith is not irrational. In fact, ultimately, the convictions of faith might provide the most rational account for why we exist. There are good reasons — even outside the Bible (although for our faith we do not need to look further) — to believe that there is a God who is interested in us. Faith-in-search-of-understanding, then, involves the whole person. We are to believe with all our being — heart and mind, will and intellect, our sweat and our I.Q.
With that said, let’s consider just one of the reasons that Christians can put forward to show that belief in God is not only appropriate, but perhaps the best option available to any thinking person. It has to do with the simple fact that the universe even exists. In the world of contemporary physics, the theory that best accounts for the nature of the universe is the one that recognizes that universe actually had a beginning. This is consistent with the revelation of scripture.
Probably you have heard of the “Big Bang” theory of the origin of the universe. This theory, which attempts to account for the data and measurements made possible by satellite telescopes, tells us, to be overly simple, that the universe is actually expanding. It is not static. The fact that the universe is expanding can be best account for by the hypothesis that it was set into motion by an event much like an explosion. Just as the energy of an explosion on earth radiates out from the origin of the blast, so the Big Bang, which created the universe has an “explosive” force that continues the expansion of the universe. Two other — and more technical — observations point to the great likelihood of an initial “explosion” of the universe into existence. They are provided by Hugh Ross: 1. The angular sizes and amplitudes of temperature fluctuations seen in maps of the cosmic background radiation precisely fit what a big bang creation scenario would predict; and 2. The measured density of protons and neutrons in the universe matches the prediction arising from the hot big bang creation scenario.
The only point I wish to make here is that the most exhaustive scientific theory available to us to explain the nature of the universe points to the fact that it actually had a beginning. While you might say, “well, of course,” it is important to understand that prior to the “Big Bang” hypothesis — before astrophysicists realized that the universe is expanding — scientists assumed that the universe was in a steady state and had always existed. In other words, scientists assumed it was eternal. That was hard to square with the Book of Genesis, since an eternal universe does not lend itself to belief in a Creator very readily. Many scientists in fact were determined that the Big Bang hypothesis could not be true when it was first developed. Why, you might ask, if it was trying to provide a scientific account of all the data? The reason is simple. Many scientists realized it had possible theological implications or at least opened the door to theology in scientific discourse.
A universe that has not always existed raises the question of where it came from, because its existence is no longer self-explanatory. (When scientists could simply say the universe has always been here, the question of how it came exist never arose.) However, the Big Bang theory recognizes that at some moment in the past everything in the entire physical universe began to exist. And before that event nothing of the physical universe existed.
P. C. W. Davies, a British physicist, waxes eloquent in his description of the event: “The big bang represents the creation event; the creation not only of all the matter and energy in the universe, but also of space-time itself.”
The problem that such a scenario presents for any honest thinker is how this occurred? If no physical laws existed prior to the “bang” and no material forces existed either — then one is faced with only a couple of options.
1. Nothing caused it to happen, it just did.
2. The universe is the cause of itself in some way.
3. Something radically different from the universe existed prior to the bang and the creation of space-time “stuff” and this “something’ is the cause of the event.
The problem with possible answer number one is that we are left with the puzzle — how does something come into existence out of nothing? That is a philosophical question, not one that is scientific or religious. If someone wants to say that there is no cause of the universe they are welcome and free to do so. But why should we think that this is a rational position? Nothing in all of logic could allow us to comprehend that nothing could be the cause of something. It is akin to having an empty basket one moment and the next having it filled with peaches, only to be told that they just appeared. It is a basic law of logic and science that “from nothing nothing comes.”
Some scientists have suggested that it is unscientific to ask about what was going on prior to the “bang,” because we don’t have any way to observe and measure and get an answer. However, that is to limit science to a very narrow definition. Maybe we can’t find a measurement or achieve an observation to give us the answer. But then, no one has ever really “seen” or measured an electron (we just observe its effects and measure them). However, we certainly can say – “Well, I can’t help but wonder what was going on before, so I don’t think I’ll check my brain at the door of the Big Bang.”
Some people have suggested that answer two is the best — that is, they think that it is possible that the entire universe is the cause of itself. But, this is, in many ways, an even more mysterious theory than believing in God. Those who suggest this might try to point to Newton’s first law of thermodynamics as support. It states that “energy can neither be created or destroyed in a closed system, it can only be converted into different forms.” so, if energy cannot be created or destroyed, then the energy has always been around. However, Newton’’s law only applies to “closed” systems — systems that are not infinite and can be measured.
Well, the universe as we know it had a beginning and it is not infinite in scope. The Big Bang theory makes us acknowledge that it had some kind of beginning. Other observations and calculations have allowed scientists to conclude that the universe is huge, but measurable — it has been measured to be 156 billion light years wide. That is mind-blowing but not infinite. So, the universe itself qualifies as a closed system. The energy present in the universe at present would itself have come into existence at the event which created everything that exists.
In other words, the universe’s own energy could not be the source of its existence, since its energy is part of its own existence. Just as something does not come from nothing (by the laws of logic), no finite entity can be the cause of itself. Just as I am not the cause of myself, neither does it really make sense to think of the universe as causing itself to exist. So, we are left with number 3.
Something else is the cause of the universe. And that cause would have to be, in the words of the American philosopher William Lane Craig, “uncaused, immaterial, timeless, and enormously powerful.” It would have to be “uncaused” in order to be the source of everything else. It would have to be “immaterial” (not physical) because prior to the bang none of the physical stuff or physical laws existed. It would have to be timeless, because time itself begins to exist at the same moment that space does. And it would have to be enormously powerful to cause an event to occur from nothing.
Does such an explanation provide us with a knock-down, irrefutable proof of God’s existence? Of course not! There is almost no such thing as an irrefutable proof of anything. But, it does allow us to realize that believing in the God of the Bible is a credible intellectual belief to embrace. It actually answers many questions that scientists have, even if philosophers can raise new ones. We do not need to be intimidated in the least by high-talking, cultured-despisers of faith.
Realizing the rationality of faith, of course, cannot save us. That is another matter. But, we can with the Apostle Paul say that “”Since the creation of the world, God’s invisible qualities — his eternal nature and divine qualities — have been clearly seen, being understood from what has been made, so that men are without excuse.” At the final judgment, our rational calculations will not justify us before God, but neither will anyone’s claim that there just was not enough evidence to even begin to think about Him. Before the glory and all-surpassing love of God, each of us will be able to see exactly how we ignored reality to suit ourselves. The fact that we as Christians not only believe in God’s existence, but are convinced that He is good and loves us is not a tribute to our ingenuity. Instead, it is a testimony to His grace that has drawn us to surrender our hearts, minds, wills, and hands to the most rational of all conclusions.
That conclusion? “The One who takes the name I AM is not just real, but is the ultimate reality.”