Faith Made Reasonable (Part II)
A Defense of God, Christ, and the Bible in a Doubting World
The Cosmological Argument — The God Behind the Beginning
Everything That Begins to Exist Has a Cause
At the heart of the cosmological argument is one of the simplest and most universally understood truths: things don’t just pop into existence without a cause. If you walked outside and saw a fully functional, humming jet engine appear out of thin air on your lawn, you wouldn’t assume it just happened; you’d immediately assume a cause. This common-sense principle underlies the cosmological case for God’s existence.
The Kalam Cosmological Argument, revitalized in recent decades by Christian philosopher William Lane Craig, frames the argument in this way:
- Whatever begins to exist has a cause.
- The universe began to exist.
- Therefore, the universe has a cause.
Each of these premises is philosophically defensible and scientifically supported, and they lead to a conclusion that points not just to a cause, but to a timeless, spaceless, immaterial, personal Creator.
Premise 1: Whatever Begins to Exist Has a Cause
This is not merely a theological claim; it’s a metaphysical one. If something can come into being uncaused from nothing, then everything we know about reality collapses. There is no more reason, no more science, no more logic. “Nothing”—as in the complete absence of being—has no potential, no properties, no power. It cannot produce something.
Even atheist philosopher David Hume, deeply skeptical of religion, admitted that he never asserted anything could come into existence without a cause; only that we might not know what the cause is.
Premise 2: The Universe Began to Exist
This point is perhaps the most stunning for modern skeptics because science, particularly physics and cosmology, backs it up.
1. The Second Law of Thermodynamics
The universe is running out of usable energy. Entropy increases. If the universe were eternal, it would have already reached a state of heat death. But it hasn’t. Therefore, it must have had a beginning.
2. The Expanding Universe (General Relativity)
Einstein’s field equations and the work of astronomers like Edwin Hubble revealed that the universe is expanding. If you reverse time, this expansion leads to a singularity—a beginning point where space, time, and matter come into existence.
3. The Borde-Guth-Vilenkin Theorem
This theorem, accepted by most cosmologists, states that any universe which has, on average, been expanding must have a boundary in the past. In Vilenkin’s own words:
“It means that the universe had a beginning.”
Premise 3: Therefore, the Universe Has a Cause
And what kind of cause could bring the entire physical universe into existence?
- It must be timeless (because time itself began at the start of creation)
- Spaceless (because it created space)
- Immaterial (because it brought forth all matter)
- Extremely powerful (to create a universe from nothing)
- Personal (because impersonal forces cannot choose to create; only a will can do that)
This is a perfect description of what Christians mean by God.
Objections and Responses
Objection: “If everything needs a cause, then what caused God?”
Response: The argument doesn’t say everything needs a cause—only things that begin to exist. God, by definition, is eternal and necessary. He did not begin to exist. He simply is.
Objection: “Maybe the universe is just a brute fact.”
Response: That’s not an argument—it’s a retreat. Saying “it just is” is intellectually lazy. Why this universe? Why now? Why laws of physics that are finely tuned for life? Brute fact explanations ultimately deny the pursuit of reason.
Objection: “Quantum particles pop into existence from nothing.”
Response: They don’t. Quantum fluctuations occur in a quantum vacuum, which is not “nothing”; it is a sea of energy governed by physical laws. This is not the same as absolute nothingness. Nothing can’t do anything, by definition.
Why It Matters
The cosmological argument is grounded in both philosophy and science. It answers the question that haunts every worldview but materialism: Why is there something rather than nothing?
The answer is not an impersonal explosion or a metaphysical shrug. The answer is a Creator; one who exists beyond space and time, who chose to bring the universe into being not out of necessity, but out of purpose.
As C.S. Lewis once said:
“The universe is a great miracle. It’s not the miracle of chance, but the miracle of will.”
The God who started the beginning is not just a cause but a personal being, the One who will ultimately step into that creation to reveal Himself more fully. That’s where we’re going next.
The Teleological Argument — The God Who Designed It All
Order, Precision, and the Signature of a Designer
The more we learn about the universe, the more it seems like someone has been expecting us.
From the vastness of galaxies to the complexity of DNA, the cosmos gives off a distinct impression: it was designed. The teleological argument—from the Greek telos, meaning “purpose” or “end”—builds a powerful case for the existence of God based on the order, purpose, and fine-tuning we observe in nature.
This argument doesn’t merely suggest that the universe is, but that it is intentionally structured. It’s not random chaos that gave birth to life and meaning; it’s an intricately crafted masterpiece, one that points to a Master Mind.
The Fine-Tuning of the Universe
Modern cosmology has uncovered dozens of physical constants that had to be set at exactly the right values for life to be possible. These include:
- The gravitational constant
- The cosmological constant
- The strong and weak nuclear forces
- The mass of the electron and proton
- The expansion rate of the universe
- The ratio of matter to antimatter
- The electromagnetic force
If any one of these constants were even slightly different, off by one part in millions, billions, or even trillions, life as we know it could not exist. Not just human life, but any life.
Astrophysicist Hugh Ross famously calculated the odds of all life-permitting conditions appearing by chance as roughly 1 in 10⁵³⁰. For perspective, there are only about 10⁸⁰ atoms in the entire universe.
This doesn’t look like an accident; it looks like intent.
The Watchmaker Returns: Paley’s Classic Argument
In the 19th century, William Paley famously argued that if you found a watch in the forest, you would naturally assume it had a maker. It’s too precise, too functional, too purposeful to be a product of chance. The complexity of the universe, and especially of living systems, is infinitely greater than a pocket watch. Why assume design in one case and deny it in the other?
Though atheists often mock Paley’s analogy, modern science has revived its force. The deeper we look into biology, astronomy, and quantum physics, the more “watch-like” the universe becomes.
Biological Complexity: Design at the Cellular Level
Darwin’s theory of evolution was offered at a time when cells were thought to be simple blobs of protoplasm. We now know that even the simplest cell is a miniature factory, full of nanomachines and information-processing systems. DNA stores a massive amount of digital code, billions of letters long, that instructs cells how to build life.
Stephen Meyer, in his book Signature in the Cell, makes the case that this kind of information cannot arise from unguided processes. It points to a mind. As philosopher Anthony Flew, once one of the world’s most prominent atheists, admitted before his death:
“The almost unbelievable complexity of the arrangements which are needed to produce life show that intelligence must have been involved.”
This was not a Christian saying that. It was a lifelong skeptic following the evidence.
Objections and Responses
Objection: “Just because the universe appears fine-tuned doesn’t mean it was designed.”
Response: The inference to design is based on how we reason in every other context. If we saw the word “hello” written in the sand, we’d never conclude it happened by chance, even though natural forces like wind and waves exist. The best explanation for fine-tuning is a fine-tuner.
Objection: “There could be an infinite number of universes (the multiverse), and we just happen to be in the one that supports life.”
Response: The multiverse theory is speculative and unprovable. It multiplies untestable entities to avoid the most obvious explanation: design. Even if other universes exist, the mechanism producing them would itself have to be finely tuned, which just pushes the problem back a step.
Objection: “Evolution explains complexity without needing God.”
Response: Evolution (even if true) only works within existing biological systems and laws. It doesn’t explain the origin of life or the origin of information. The teleological argument addresses a higher level of design: why the conditions even exist for “evolution” to operate at all.
Why It Matters
Design implies a Designer. And this Designer isn’t some detached force or abstract principle. He is intentional, intelligent, and purposeful. The universe doesn’t just allow life; it welcomes it. Earth is not just a planet; it’s the planet, uniquely placed, shielded, nourished, and stable.
As C.S. Lewis once said:
“If the universe is so meaningless, then why do we feel so compelled to demand that it make sense?”
The teleological argument awakens in us that ancient and deep suspicion: maybe we are not accidents. Maybe we were made. And maybe the One who made us has left His fingerprints not just in stars and atoms, but in our very souls.
With the ontological, cosmological, and teleological arguments established, we now move from general revelation to specific revelation: Has this God spoken? Has He entered human history? In the next post, we turn to the centerpiece of all apologetics: Jesus Christ.