The Kalam cosmological argument in Islam
The kalam cosmological argument is, by name and origin, an Islamic argument — formalized by medieval mutakallimun like al-Ghazali to defend the Qur'anic doctrine of creation ex nihilo against Aristotelian eternalism.
The word kalam means "speech" or "discourse" in Arabic and refers to the discipline of Islamic systematic theology (ilm al-kalam). The kalam cosmological argument, then, is not a recent apologetic invention but the signature contribution of medieval Islamic theology to philosophical theism. It was forged in the long argument between the mutakallimun and the falasifa — the Aristotelians like al-Farabi and Avicenna who defended an eternal universe against the orthodox doctrine of creation in time.
Its classical statement comes from Abu Hamid al-Ghazali in The Incoherence of the Philosophers (1095). The argument has three steps: whatever begins to exist has a cause; the universe began to exist; therefore the universe has a cause. Al-Ghazali defended the second premise philosophically, arguing that an actually infinite past is logically incoherent — you cannot traverse an infinite series to arrive at the present moment. He paired this with theological appeals to the Qur'an's doctrine that God brought the heavens and earth into being from nothing (Qur'an 2:117, 6:101).
The argument lay relatively dormant in Western philosophy until William Lane Craig revived it in his 1979 dissertation The Kalam Cosmological Argument, explicitly crediting the Islamic tradition. Craig added contemporary support from Big Bang cosmology and the Borde-Guth-Vilenkin theorem. Modern Muslim philosophers like Shabbir Akhtar and apologists at organizations like Sapience Institute have in turn re-claimed kalam as Islamic intellectual heritage. The argument now functions as a rare point of substantive overlap between Christian apologetics and Islamic theology, with both traditions defending its premises against atheist critics like Wes Morriston and Graham Oppy.
- al-Ghazali— Classical formulation in The Incoherence of the Philosophers (1095)
- al-Kindi— Earliest systematic kalam cosmological reasoning (9th century)
- Mutakallimun— Theologians of the Ash'ari and Maturidi schools
- William Lane Craig— Modern Christian revival of the kalam argument
- Shabbir Akhtar— Contemporary Muslim philosopher of religion
“Originator of the heavens and the earth. When He decrees a matter, He only says to it, 'Be,' and it is.”
“Every being which begins has a cause for its beginning; now the world is a being which begins; therefore, it possesses a cause for its beginning.”
“It is impossible for an infinite to enter into existence either in essential ordered series or in accidental ones.”