Unfortunately, it will take the child until they are 20 or so to feel the full effects of being poorly educated, worse, being denied the tools of critical thought. At that point bringing that person up to the capability to deal with the technology of the workplace that will face them in 2030 will be nearly insurmountable.
The mere fact that someone should be able to assert that any old idea they have, has equal supportability because of what they assert semantics of words to be, is wrong at best, and megalomaniacal at worst. And we all know that this isn't about "alternate 'theories'" this is about attacking things that don't support the christian creation myth.
I challenge *any* "teach the controversy" supporter to lay out their syllabus and rubric for *ALL* alternative science theories. As it has been stated above, it would have to include astrology, and alchemy, probably phrenology, humors, and I guess demonic possession.
You cannot be honest in this "teach the controversy" thing and only do one piece. Doing so is really a lie to yourself, and everyone knows it.