Argument #1: Creation is not scientific, because creation is not testable, reproducible, or repeatable. Evolution, on the other hand, is scientific, and should be taught in science curricula, while creation should not.
Response: For a theory to qualify as a scientific theory, it must be supported by events, processes, or properties that can be observed, and the theory must be useful in predicting the outcome of future natural phenomena or laboratory experiments. In addition, the theory must be capable of falsification. That is, it must be possible to conceive of some experiment, the failure of which would disprove the theory. It is on the basis of such criteria that most evolutionists insist creation be denied respectability as a potential scientific explanation of origins. Creation has not been witnessed by human observers, it cannot be tested experimentally, and as a theory it is nonfalsifiable. Notice, however, that the General Theory of Evolution (organic evolution) also fails to meet all three of these criteria. No one observed the origin of the Universe or the origin of life. Similarly, no one has observed the conversion of a fish into an amphibian or an ape-like creature into a man. Paul Ehrlich and L.C. Birch, both evolutionists, have stated:
Our theory of evolution has become...one which cannot be refuted by any possible observations. Every conceivable observation can be fitted into it. It is thus “outside empirical science” but not necessarily false. No one can think of ways in which to test it. Ideas, either without basis or based on a few laboratory experiments carried out in extremely simplified systems have attained currency far beyond their validity. They have become part of an evolutionary dogma accepted by most of us as part of our training (1967, 214:349).
In a symposium at the Wistar Institute in Philadelphia (on the mathematical probabilities of evolution actually having occurred), Murray Eden, in speaking about the falsifiability of evolution, said:
This cannot be done in evolution, taking it in its broad sense, and this is really all I meant when I called it tautologous in the first place. It can, indeed, explain anything. You may be ingenious or not in proposing a mechanism which looks plausible to human beings and mechanisms which are consistent with other mechanisms which you have discovered, but it is still an unfalsifiable theory (1967, p. 71).
Neither creation nor evolution is testable, in the sense of being observable experimentally. Both, however, can be stated as scientific models. It is poor science, and even poorer science education, to restrict instruction solely to the evolution model. When evolutionists attempt to depict evolution as the only scientific model, they are no longer speaking in the context of scientific truth. Either they do not know what the data actually reveal, or they are deliberately attempting to deceive. Evolution fails to answer more questions than it purports to answer, and the creation model certainly has as much (and often more) to offer as an alternative model. It is not within the domain of science to prove any concept regarding ultimate origins. The best one can hope for in this area is an adequate model to explain circumstantial evidence at hand. When one observes the undeniable design of every living thing, the complexity of the Universe itself, and the intricate nature of life, the creation model becomes quite attractive. It at least possesses a potential explanation for such attributes. The evolution model does not, but instead asks us to believe that design, inherent complexity, and intricateness are all the result of chance processes operating over eons of time.
(taken from Dripping Springs)