The difference between Deism and Intelligent Designer is that the "creator" in Deism does not interfere with the universe and its natural laws. In order for an intelligent designer to design the organisms, he would have to swoop in whenever the environment changes and design a new organism, which just appears out of nowhere. Now isn't that interference?
I've originally thought the Intelligent Designer was some creationist's attempt at trying to make Creationism sound more scientific, by adding this idea behind it, just as Evolution works on natural selection, but they still don't realize Intelligent Designer still has to be explained, just as Creationism and Evolution and natural selection have to be explained. I don't know if they thought they could get away with the explanation part of it by sticking in Intelligent Designer, but obviously, they've failed.
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