Since He...uh, I mean, it, put nervous system genes in sea sponges.
Obviously, evolutionary change explains this very well -- the components necessary for nervous systems must have been present as precursors in our ancient ancestors. The idea is that co-option, or exaptation, confers upon existing genes new functions. Why do sea sponges need them if God "designed" everything that way? For those animals that have no need for the function, why in the hell would they need the genes, if they were specially created? There is no logical answer.
Ed has an excellent discussion of this.
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