What is the kalām cosmological argument in its simple formulation, and why is it considered important today?

The kalām cosmological argument is one of the most famous philosophical arguments for God's existence in Islamic tradition and contemporary discussion. It was developed by Muslim theologians (mutakallimūn) like al-Ghazālī, and revived in the modern era by philosopher William Lane Craig. Its simple formulation consists of three steps: (1) everything that has a beginning has a cause, (2) the universe has a beginning, (3) therefore the universe has a cause. This cause—which transcends time, space, and matter—is what philosophers call "God." The argument appears simple but carries philosophical and scientific depth that makes it central to contemporary debate.

Why "kalām"?

It is called "kalām" in reference to Islamic theology (ʿilm al-kalām), where Muslim theologians developed it in the medieval centuries. What distinguishes it from other cosmological arguments (like Aristotle's or Avicenna's) is its focus on the "temporal beginning" of the universe, not merely causal dependence. The mutakallimūn insisted that the universe is created (ḥādith)—having a beginning in time—and not eternal as many Greek philosophers believed.

Inadequate Responses to Avoid

From some believers:

"The argument is very clear; whoever denies it denies obvious truths." This is hasty. The argument actually depends on precise philosophical and scientific premises that require justification. For example: Does the principle of causality apply to the universe as a whole? Is the temporal beginning of the universe scientifically proven definitively? Treating the argument as obvious ignores serious philosophical discussion about it.

"The Qur'an says that God created the heavens and the earth, and this is sufficient." This confuses levels. The kalām argument is a rational attempt to prove what revelation states, but it does not depend on revelation for its proof. Conflating rational argument with religious text weakens the former and does not serve the latter.

From some deniers:

"If everything has a cause, who created God?" A common objection but it targets a misunderstanding of the argument. The argument does not say "everything has a cause," but "everything that has a beginning has a cause." God, according to religious conception, is eternal with no beginning, so the principle does not apply to Him. The objection attacks a straw man.

"Perhaps the universe arose from nothing without a cause; quantum physics allows this." A superficial understanding of quantum physics. Even in quantum mechanics, particles do not arise from "absolute nothing," but from a quantum vacuum that has energy and laws. The quantum vacuum is not nothingness but "something" with physical properties. The question remains: Where did the quantum vacuum and its laws come from?

Why These Responses Are Inadequate

They share in misleading oversimplification. The kalām argument is neither a religious slogan nor a myth easily refuted, but a philosophical argument with precise logical structure and rich academic discussion. Dealing with it—whether accepting or rejecting—requires understanding its details and assumptions, not settling for ready-made responses.

First Premise: The Principle of Causality

"Everything that has a beginning has a cause"—this principle seems obvious to many. We see it in daily life: things do not appear from nothing. But philosophically, the principle needs justification. Defenders of the argument say that denying the principle leads to absurdity: if things appeared without cause, why don't we see elephants appearing in the living room? Why does the universe specifically appear and not anything else?

Critics respond that the principle of causality may not apply to the universe as a whole. Perhaps it applies within the universe (to events and things in it) but not to the universe itself. This is a deep philosophical discussion about the nature and limits of causality.

Second Premise: The Beginning of the Universe

Here the contemporary kalām argument distinguishes itself through its interaction with modern science. Big Bang theory, which has become the standard model in cosmology, indicates that the universe had a beginning approximately 13.8 billion years ago. This appears to be strong scientific support for the second premise.

But the matter is not this simple. Some contemporary cosmological models (like cyclic universe models or some quantum gravity models) attempt to avoid an absolute beginning. The scientific discussion remains open, though the general trend supports the idea of a beginning.

Craig and others also provide philosophical arguments for the impossibility of an infinite past, independent of scientific evidence. These arguments are complex and relate to the nature of actual infinity.

The Conclusion: Nature of the Cause

If we accept both premises, then the universe has a cause. But what is the nature of this cause? Defenders of the argument say that the cause of the universe must be: (1) outside time and space (because they are part of the universe), (2) immaterial (because matter is part of the universe), (3) supremely powerful (to bring about the universe), (4) personal (because an impersonal cause cannot bring about a temporal effect from a timeless eternity).

The last point is controversial. Why must the cause be personal? Craig argues that an impersonal cause (like a natural law), if it were eternal and sufficient, would have an eternal effect (the universe) as well. But the universe is not eternal. Therefore the cause is personal, choosing to create the universe at a particular moment.

Why the Argument Is Important Today

First, because it interacts with contemporary science. Unlike many traditional philosophical arguments, the kalām argument benefits from recent scientific discoveries (Big Bang, thermodynamics, cosmic expansion) in supporting its premises.

Second, because it is simple in structure, deep in content. It can be explained in minutes, but discussing it deeply requires understanding in philosophy, science, and logic. This makes it an excellent entry point for philosophical discussion about God's existence.

Third, because it transcends traditional religious divisions. The argument does not prove the god of a particular religion, but a "first cause" of the universe. This makes it common ground for dialogue among monotheistic religions, and even with deists and open-minded agnostics.

Contemporary Positions on the Argument

The strong defensive position: Philosophers like William Lane Craig, Alexander Pruss, and Robert Koons see the argument as very strong, perhaps the strongest argument for God's existence. They develop it with contemporary logical and mathematical tools.

The critical position: Philosophers like Graham Oppy, Quentin Smith, and Adolf Grünbaum offer technical criticism of the argument. They question the principle of causality, or its application to the universe, or the theological conclusions.

The balanced position: Many contemporary philosophers see the kalām argument as providing considerable reason for believing in a cause of the universe, but it is not a decisive proof. It is considered part of a cumulative case, alongside other arguments.

For Advanced Reading

─ Intermediate level: The difference between the kalām argument and the argument from contingency and necessity
─ Advanced level: Grünbaum's critique of the argument from the perspective of philosophy of time
─ Craig's book "The Kalām Cosmological Argument" (1979)
─ Sobel's response in "Logic and Theism" (2004)
─ "Kalam Argument" family page on the website