... is the closing of minds
ideas are dangerous to closed minds.

However, an open mind is no reason not to properly categorize things.

The question of what is versus what isn't science is one of philosophy. Science requires certain underlying philosophical assumptions; the question of what assumptions should be used is fair to debate... but is NOT a scientific question.

Assumptions of basic Boolean logical and Zermelo-Fraenkel set theory axioms are exceptionally uncontroversial in philosophy. They allow for construction of most of the familiar mathematics geeks play with. If you make the assumption of the Strong Church-Turing Universe Thesis to bound complexity, you can derive (or, being sensible, read the papers where Wallace/Dowe and Vitanyi/Li derived) a formal relationship between "Minimum Description Length Induction, Bayesianism and Kolmogorov Complexity", which allows for a rigorous definition of science as competitive testing for a very formal sense of "simplest descriptive explanation for all the evidence". And, no, "God Diddit!" doesn't win, because it's insufficiently descriptive of the evidence under the formal criteria.

As such, Intelligent Design becomes a candidate hypothesis rejected because it does not descriptively explain the evidence anywhere near as concisely as Evolution. Intelligent Design is not science, any more than the idea of the Luminiferous Ether is. Perhaps the Search for Intelligent Design might remain a scientific pursuit (as SETI is), but to do so it must admit that it has failed even more miserably than SETI.