Answer: Because creationists don't perform peer-reviewed research and creationism isn't science.
So now peer review is the criteria for whether something is *science* now?
Too bad for Newton, Kepler, Copernicus, Curie, Pasteur, Mendel, who didn't get their work peer reviewed.
I though peer review was all a joke anyway, along with all conventional scientific research methodology (including this one).
Let's examine my statement to demonstrate where you went wrong. I said "creationists don't perform peer-reviewed research and creationism isn't science." I did not say "creationists don't perform peer-reviewed research, therefore creationism isn't science." See the difference?
Of course peer review is not the definition of science. However, if a modern area of study wholly lacks a peer review process (as does creationism) it is a gigantic red flag that it probably is not producing work that fits any modern notion of "science."
I hope this clears things up for you.