I believe that anything that is a theory should be taught as a theory with the predominant counter theories explored. There seems to be a real resistance to doing that, however, and that has always seemed strange to me. Intellectual vigor would seem to me to demand presenting and exploring competing theories.Ah, but the key word is "predominant". Sure, creationism and/or ID makes a lot of noise in the culture at large, but within the discipline of the relevant sciences, there's nary a ripple. And that's not because of prejudice, conspiracy, nor as some claim, nihilistic scientists recoiling at having to answer to a higher authority figure than themselves.
I do not see any need to keep every discipline so tightly segmented. God forbid that a child learn some math in reading class, or learn some history in science class, or learn some english in history.