The idea of "teaching the controversy" is built upon a false premise, that there is a controversy within the scientific community on the issue of evolution. Well, there isn't. Evolution is, in fact, mainstream science.
The seductive "let's teach the controversy" language conveys the false idea that there really are two sides.
It is not a scientific argument at all, but a religious one. It might be worth discussing in a class on the history of ideas, in a philosophy class on popular logical fallacies, or in a comparative religion class on origin myths from around the world.
But it no more belongs in a biology class than alchemy belongs in a chemistry class, phlogiston in a physics class or the stork theory in a sex education class. In those cases, the demand for equal time for "both theories" would be ludicrous. Similarly, in a class on 20th-century European history, who would demand equal time for the theory that the Holocaust never happened?