I don't know how we can derail this as a wedge issue. I'm more than willing to let people believe what they want to believe, but they are lobbying to teach this in Science classes! In our Public school systems!
We can't just ignore it. So what do we do?
I'm not sure what the best course is either, but I'm pretty sure that rhetoric denigrating people of faith as irrational "wackos" will only harden the resolve of the hard core and alienate the moderates that could come to our side. The American cultural phobia against science (despite the remarkable technological gifts it has given us) will not be solved by a fight over a relatively small part of the science curriculum.
I suspect the answer lies in changing the subject to economic matters that have more direct relevance to our lives. Defer the debate to the communities and let them hash it out at the school board level. Localism is the wave of the future, right?