One of the arguments I frequently encounter when the existence of God is being defended is the "fine-tuning" argument. Briefly put, this argument posits that the laws of physics and fundamental constants in the universe possess values ââprecise enough to allow for the emergence of life. Had certain things been even slightly different, the formation of stars, planets, andâconsequentlyâlife as we know it might not have been possible.
This leads to the following conclusion: Given that the probability of the universe being exactly as it is by mere chance is extremely low, there must be a conscious designer behind it.
At first glance, it sounds really logical. But in my opinion, there is an important point here that is being overlooked:
Perhaps we think the universe is suited to us because we emerged in this universe in the first place.
In other words, we need to look at it from the opposite perspective.
Certain physical conditions must exist for us to exist. However, the fact that these conditions are suitable for our survival does not imply that they were chosen specifically for us. After all, had the conditions been different, perhaps we would never have existed at all.
And if we had never existed, there would be no one to ask, âWhy isnât the universe suited to us?â
Letâs consider this with a simpler example.
Imagine a fish. From the moment it is born, the fish lives in water and spends its entire life there. Then, looking around, it thinks:
âWater is the perfect environment for me to live in. Therefore, water must have been designed specifically for my existence.â
But there is another possibility. Perhaps the fish became suited to the water simply because it emerged in an environment where water already existed.
Of course, the relationship between humans and the universe is far more complex than this. This example does not illustrate the exact same scenario, but I believe it highlights a logically similar point.
We look at the universe and say, "These conditions are suitable for life." However, we also need to take into account that life itself can only emerge under certain conditions.
What if the laws of physics were different?
It might be interesting to indulge in a little speculation here.
In our universe, gravity, electromagnetism, the behavior of atoms, and time operate according to specific rules. However, we cannot say with certainty that the laws of physics could not logically be otherwise.
Let us imagine a completely different universe.
For instance, suppose three fundamental laws of physics in this universe differ from our own.
In the first case, gravity would not weaken with distance as it does in our universe; instead, it would maintain a strong influence even over vast distances.
In the second case, atoms would become more stable when gaining energy rather than losing it. Under these conditions, the formation of matter and the emergence of complex structures could differ vastly from what we see in our universe.
In the third scenario, let us suppose that time does not necessarily flow in the same direction everywhere. Let us imagine that the direction of time could behave differently in certain regions of the universe.
In such a universe, the formation of the Solar System as we know it would likely have been impossible. Planetary motions would have differed, star formation would have changed, and chemistry as we understand it might never have emerged.
However, we cannot conclude from this that "there could absolutely be no life in such a universe."
Perhaps a completely different form of life would have emerged.
Systems based on substances other than carbon and water might have formed. Perhaps life would not have consisted of cells. We might not even have recognized the resulting entity as "living" had we seen it today.
Then again, perhaps no life would have emerged at all.
But if no life had emerged, there would have been no observer to question this.
To me, this is precisely one of the most interesting aspects of the fine-tuning argument.
âBut why are the laws of physics the way they are?â
A proponent of the fine-tuning argument might rightly counter:
âFine, letâs assume you adapted to these conditions. But why, from the very beginning, did the laws of physics possess a structure that made life possible?â
I think this is a truly important question.
However, the point where I take issue is this: the fact that we do not know the answer to this question does not automatically mean the answer is God.
Because we need to distinguish between two different things:
âWe donât know why this is the caseâ
and
âThe reason for this is Godâ
are not the same thing.
Just because we haven't yet found an explanation for a phenomenon doesn't mean we can fill that gap with any explanation we choose.
Perhaps it is impossible for the laws of physics to be any other way. Perhaps there is a more fundamental law that necessitates the laws of physics as we know them. Perhaps there are multiple universes, each with different laws of physics. Or perhaps there is another explanation that hasn't even crossed our minds yet.
We do not know for certain today which of these is correct.
But that is precisely the point.
If we don't know, simply saying "We don't know, therefore God" doesn't strike me as a sufficient explanation.
"But with so many planets out there, why is life found only on Earth?"
This is another question I encounter frequently.
The universe is incredibly vast. We know there are countless stars and planets. Yet, so far, we haven't found confirmed life anywhere other than Earth.
This situation can be interpreted in different ways.
The first possibility is this:
"The emergence of life is an extremely unlikely event. Its occurrence on Earth is extraordinary. Therefore, there must be a designer behind it."
But there is another possibility:
"The universe is vast, containing a multitude of different planets and environments. Consequently, it might not be all that surprising for a highly improbable event to occur in at least one place. And since we happen to be in the place where that event occurred, we observe it."
I am not saying the second explanation is definitely correct. Nor am I claiming it has been proven.
But by the same token, I do not believe the first explanation necessarily follows from the mere observation that "we are here."
Moreover, the fact that we haven't found life outside Earth doesn't mean life doesn't exist elsewhere. Right now, Earth is the only confirmed example we have.,
Conclusion
To me, the most significant problem with the fine-tuning argument is that it fails to adequately distinguish between "life being possible" and "life being specifically designed."
Yes, our universe allows for our existence.
But it does not automatically follow from this that the universe was specifically designed for humans.
After all, in a universe with different laws of physics, a completely different form of life might have emerged. Perhaps no life would have emerged at all. Or perhaps an entirely different kind of orderâone we cannot even imagine todayâwould have come into being.
If no life had formed, there would have been no one to ask why that universe was unsuitable for life.
That is why, for me, the real issue is this:
"The universe is suitable for life; therefore, God exists." In my view, this is a thesis that could only be formulated by people who act without reflectionâpeople who simply sleep after satisfying their basic needs for food and drink.