The problem with ID, of course, is that it leaves open the possibility that the intelligence behind nature may have a moral interest in us, having communicated already with humanity in the past, and might try to boss you around in your private affairs. With hypothetical advanced aliens residing at a safely distant address in the hypothetical multiverse, that is - to the relief of folks like Gribbin, Dawkins and the New Scientist - manifestly not the case.
For God to prove himself on demand, physically, would be a grave disappointment, and the strongest Christians should be considerably grateful that he chooses not to do so. The skeptic endlessly demands proof, yet God refuses to insult the true intelligence of man, the '6th sense', the chief quality, the acumen which distinguishes man from the rest of creation, faith.