If I understand correctly you are making a demarcation criterion based on a certain metaphysical axiom (i.e: naturalism among many). Is this correct?
If so then I would certainly agree with you that this is a much better demarcation than say a naive testability or falsification.I gave this and another criterion based on the consensus of the scientific community as alternatives to the testable/falsifiable distinction.
Of course there remain problems with such an attempt (I nuanced it to avoid the charge of blatant circularity that a scientific theory is one that relies on the scientific axiom) and it may not eliminate all forms of "psuedoscience" but I feel that alternative criteria like these are the much sounder way to go, as opposed to what is generally argued in court cases today (relying on the testability/falsifiability criteria).
One day, should the creationist lobby not botch the case badly and get a guy who can argue convincingly against this usually used but fatally flawed demarcation principle, it would be an embarrassment for evolutionary biology...
This is an journal article from Science, Technology, and Human Values following up on a certain court decision on creationism a while back that talks about this issue pretty concisely and convincingly:
http://www.jstor.org/pss/688928
(might not be viewable in public domain)
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