Defender's Guide to Science and Creationism

Mark Vuletic


Evolution is just a theory.


I. Evolution is not speculative

When creationists dismiss evolution as "just a theory," they are claiming that it is at best a speculative proposal and at worst a mere guess. The scientific consensus, however, has recognized for over a century that evolution has been confirmed by evidence as strongly as anything can be; it is with good reason that evolution is considered the cornerstone of modern biology.

II. In what sense is evolution a theory?

But if evolution is the cornerstone of modern biology, why do scientists still refer to the "theory" of evolution? Doesn't this prove that they themselves think evolution is speculative? On the contrary, scientists use the word differently than the average person on the street. In scientific circles, the word "theory" usually designates a wide explanatory framework that has reached the highest standard of confirmation by evidence. When scientists want to talk about a mere conjecture that has yet to be confirmed, they use the word "hypothesis." As zoologist Tim Berra explains, "[a] scientific theory is the endpoint of the scientific method, often the foundation of an entire field of knowledge, and is not to be confused with the sort of 'theory' we so easily propose in everyday conversation" (Berra 1990:4).

To say that evolution is "just a theory" is at best to make a mistake comparable to saying that Copernican theory, electromagnetic theory, quantum theory, the theory of relativity, the theory of continental drift, and the germ theory of disease, to name a few, are just guesses. Evolution is a theory only in the same robust scientific sense as all of these other theories. Creationism, on the other hand, is not even a theory.

III. A creationist organization disavows the assertion

To its credit, the creationist organization Creation Ministries International advises against making this assertion (CMI n.d.). The assertion CMI recommends as a replacement (namely, that evolution is an unsubstantiated conjecture) is equally false, but at least does not try to exploit confusion about scientific terminology.


Berra TM. 1990. Evolution and the Myth of Creationism. Stanford: Stanford University Press.

CMI. n.d. Arguments we think creationists should NOT use. Spotted 21 Nov 2014.

Last updated: 26 Jan 2016

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