So explain to me: why is evolution "science" but creationism not? Seems to me that they share the common approach of making observations about nature and attempting to provide explanations about how certain observable phenomena came about. Just because one posits a deity in the mix does not mean it can't be right. (Of course, most proponents of evolution claim that a "naturalistic" explanation is required, thus eliminating creationism as an explanation on definition alone...not because it can't provide a reasonable explanation for observed phenomena.)
The simple answer is this: Creationism claims that complex natural life forms can only be created by a supernatural creator. But, if that is the case, Creationism is outside the realm of science, since science doesn't deal with the supernatural. Therefore, creationism, by definition, isn't a scientific theory.
The same argument holds for the "more scientific" variant of Creationism, called "Intelligent Design":
Intelligent Design claims that complex natural life forms can only be created by
something it terms a designing intelligence. OK... so, let's contemplate that for a bit.
If we allow the creating intelligence to be natural, by our original premise, it too must have a creating intelligence that created it, and so on. We're left with an infinite regress. So, how to go about breaking it? Well, maybe we could posit a supernatural creating intelligence. But, if we take that option we instantly take Intelligent Design outside the realm of science, and thus automatically forfeit equal status to scientific theories. So, that's no good.
The other option, is to accept that the designing intelligence can arise solely out of natural processes, which clearly contradicts the original premise of Intelligent Design, so that's out the door too.
Dang it. No matter what we do, Intelligent Design ends up being either self-contradictory or non-scientific. It's out too.
I hope this helps.
