Well, no. Teaching creationism is the functional equivalent of teaching an alternative version of history in which the United States bombed Japan at Pearl Harbor, not the other way around. And that's just wrongheaded. Creationism, like the idea that maybe the United States really attacked Japan, is not supported by any available evidence. So while some people may believe that, it has no business being taught in schools.
Nope. Teaching Creationism--or should I say, explaining the reasoning behind Creationism--is no more radical than explaining that the JAPANESE thought they had the right to attack Pearl Harbor, to use your example. But it's a bad example. Explaining Creationism is not only logical, but necessary in teaching Evolution, as the questions raised by Creationism can be easily knocked down BY Evolutionary theory. It's all part of the learning process; you don't just say 'Here's Evolution, and I'm not going to tell you all about the huge uproar it caused because that would be giving weight to Creationism." That's retarded.