Daniel Dennett on The Kalam cosmological argument

Dennett engaged the Kalam with the tools of analytic philosophy, focusing on the ambiguity in its key terms. The phrase 'begins to exist' has clear meaning when applied to objects within the universe — a table begins to exist when someone builds it from pre-existing wood. But the universe is not an object within the universe; it is the totality of physical reality. Whether it 'began to exist' in the same sense as a table is precisely what is at issue, and the Kalam assumes rather than demonstrates that it did.

He was also sceptical of the causal principle invoked by the first premise. Our experience of causation is entirely within the universe — we observe causes and effects in a framework of space and time. Extrapolating this framework to the origin of the universe itself is, Dennett argued, a category error. The causal principle may be a feature of the universe rather than a principle that applies to the universe.

Dennett's deeper concern was methodological. The Kalam attempts to settle an empirical question — the origin of the universe — through a priori reasoning. Dennett, like Sagan, believed that questions about origins are ultimately scientific, and that philosophical arguments can clarify concepts but cannot substitute for evidence.