Okay, so if the important part of being an engineer is the safe design and synthesis of an object as a whole from diverse materials, then a general contractor is an engineer while a carpenter or a drywaller isn't.

If I were nitpicky, I'd ask if a semiconductor engineer were really a craftsman, because he's expected to be good at designing and creating chips, using primarily the single material of silicon and a few transistors.

I think what you're really trying to say is "Engineers design complex things and craftsmen don't." That's a fair opinion. I completely disagree, but I think it's much closer to your opinion than the silly metaphors I dragged you to. :)