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The problem we are having is that the word "theory" in our general culture equates closely with "an idea," and many ideas can coexist. In science the word "theory" designates a consensus view of the scientific community. I think, but may be incorrect, that only one theory in a given scientific realm is possible at a time-or there would be no consensus.
Plate tectonics was a hypothesis until it became a consensus view, at which point it could be called a theory.
Of course, any theory in science is subject to revision and even can be overturned. Using plate tectonics as an example, moving continents were discussed for many years but there was only a hypothesis with little support until the beginning of the plate tectonics revolution. In the early stages of this revolution the problems with a stable earth became apparent. Even those not associated with the plate tectonics hypothesis recognized numerous problems with the then current explanations of a stable earth (e.g. the fit of the continents, difficulty in explaining mountain building, thrust plates, island arcs, etc.). Plate tectonics began to have many advocates when it provided solutions to these problems.
At present the Theory of Evolution does not have fundamental problems within the scientific community. Intelligent design solves no problems that the Theory of Evolution does not already cover. Intelligent design has no advocates within the scientific community. Read through the abstracts of the geological and biological national meetings. Evolution is not seen as problematic. The scientific community fully accepts the Theory of Evolution, and there are no contenders for the throne.
In the scientific world, intelligent design is not a theory. It is at best a very poorly framed hypothesis. There is no way to test the hypothesis. The hypothesis lacks credibility in the scientific community (see contents of abstract volumes and the major journals.)
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