Biblical Texts Engaged
William Lane Craig's revival of the Kalam cosmological argument draws on biblical texts that assert the temporal beginning of the universe and the existence of a timeless, powerful Creator. Genesis 1:1 -- 'In the beginning God created the heavens and the earth' -- is the foundational text: the phrase 'In the beginning' (bereshit in Hebrew) asserts that the universe had a beginning -- it did not exist eternally but came into existence through a creative act of God. This is not merely a poetic statement but a theological and cosmological claim: the created order is not co-eternal with God but is contingent, dependent, and temporally bounded.
John 1:1-3 echoes Genesis 1 in its opening words -- 'In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through him all things were made; without him nothing was made that has been made' -- and asserts both the pre-existence of the Logos and the dependence of the entire created order on divine creative agency. The claim that 'without him nothing was made that has been made' is an assertion of creatio ex nihilo -- creation from nothing -- that rules out the eternal existence of matter alongside God.
Isaiah 40:28 -- 'Do you not know? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth' -- attributes to God the quality of being 'everlasting' (olam in Hebrew, implying both eternal past and eternal future existence) while affirming his role as Creator of the universe. This implies that God is not bound by time in the way that created things are -- a metaphysical claim that Craig develops into the argument that the cause of the universe must be timeless and spaceless.
Core Argument
Craig's Kalam cosmological argument, originally developed in The Kalam Cosmological Argument (1979) and elaborated over several decades, has three premises and a conclusion: (1) Everything that begins to exist has a cause of its existence. (2) The universe began to exist. (3) Therefore, the universe has a cause of its existence. The conclusion is then analysed to determine the nature of this first cause.
Craig defends premise 1 (the causal principle) through both philosophical analysis and scientific evidence. Philosophically, the principle is self-evident: nothing comes from nothing. Scientifically, every event in the universe has a cause. Premise 2 (the beginning of the universe) is defended through two independent lines of argument. First, philosophical analysis of the nature of the infinite: Craig argues that an actually infinite series of past events is philosophically impossible, because it would lead to absurdities like Hilbert's Hotel and the subtraction of infinities. Second, scientific evidence: the Big Bang model in standard cosmology implies that the universe began approximately 13.8 billion years ago from a singularity. This is confirmation from natural science of what Genesis 1:1 asserts theologically.
From the conclusion that the universe has a cause, Craig analyses the nature of this cause. It must be uncaused (to avoid an infinite regress), timeless (because it exists prior to time), spaceless (because it exists prior to space), immensely powerful (because it produced the entire universe from nothing), and personal (because a timeless cause of a temporal effect must exercise libertarian free will -- only a personal agent can choose to create at a particular moment without prior determining conditions). These attributes match the biblical portrait of God: eternal, omnipotent, personal, and Creator.
The argument is a philosophical elaboration of the claim implicit in Genesis 1:1 and Isaiah 40:28: the universe had a beginning, and its beginning requires a cause that is timeless, powerful, and personal -- the God of biblical monotheism.
Legacy
Craig's revival of the Kalam argument has made it one of the most widely discussed arguments in analytic philosophy of religion. His debates with atheist philosophers including Quentin Smith, Peter Atkins, and Lawrence Krauss have reached large popular audiences and stimulated sophisticated philosophical responses. Objections have focused on the causal principle (is it a priori true or merely empirical?), the impossibility of actual infinites (contemporary mathematicians dispute Craig's analysis), and the implication that the cause must be personal.
Craig's work has demonstrated that the classical arguments for God's existence -- rooted in the biblical conviction that the universe had a beginning and a Creator -- can be formulated with philosophical rigour that engages contemporary cosmology and analytic philosophy. The Kalam argument remains a live contribution to the ongoing philosophical dialogue between natural theology and science, and its direct rootedness in Genesis 1:1 and Isaiah 40:28 illustrates how biblical texts continue to generate philosophical and scientific inquiry.
Philosophical Objections and Responses
The Kalam argument has attracted sophisticated objections that Craig has spent decades addressing. The most technically challenging concern the concept of actual infinites. Craig argues that an actually infinite series of past events is impossible because it would require completing an infinite task -- traversing an infinite number of moments to reach the present. Critics including Graham Oppy and Wes Morriston respond that Craig's arguments against actual infinites are not compelling: mathematicians routinely work with actual infinites without contradiction, and Craig's paradoxes depend on treating mathematical infinites as if they behaved like concrete physical quantities.
A second class of objections targets the causal premise: 'everything that begins to exist has a cause.' Quantum mechanics appears to permit causally undetermined events -- quantum fluctuations that produce particles without prior determining causes. Craig responds that quantum mechanical events are not truly uncaused but have probabilistic causes within the quantum field, and that the quantum field itself -- part of the universe -- requires a cause. A third objection, pressed by Paul Davies and others, asks why the first cause must be personal. Craig argues that only a personal agent can choose to create at a specific moment without being determined by prior conditions, since non-personal causes that are sufficient for their effects produce those effects necessarily and therefore cannot explain why the universe began at one moment rather than another. The argument thus connects the cosmological argument to the biblical understanding of God as a personal Creator who acts freely.