One of the fundamental claims of the IDers is that it's possible to construct mathematical tests that distinguish between designed things and natural things. I haven't ever seen such a thing, but if someday somebody comes up with such a test, I'll be glad to consider it. But right now I have no reason to believe that such a test is possible. All I know is that Dembski, et al. want one, and that they expect it to tell them that organisms are designed and not natural.
This, to me, is a very interesting subject, in that I make a living as a designer...perhaps the reason why I am interested in these crevo threads.
Christians believe that the entire universe and everything in it is designed by God. No-one can show that this belief is false. It gives rise to the unfortunate consequence (for Dembski), however, that Dembski's marvellous "design filter" could never provide a false positive if he ever managed to construct such a filter. After all, everything is designed, so the design filter can never be wrong when it says of a particular object, "Yep, Design!". Spectacularly useless.