How exactly is posting a Native American creation story an ad hominem attack? Who is being personally attacked here? I believe that the point Coyoteman makes is that there's no objective reason to reject this story and accept the Christian creation story; it's just a matter of faith, and that those who support the teaching of creationism in schools would be hypocritical not to support the teaching of other creation stories such as the posted one. This is certainly not an ad hominem attack; it's a point that, if wrong, needs to be refuted by creationists.
Note that we have two Creationist Conservatives that believe that "posting a Native American creation story" is an ad hominem attack and that pointing out that someone's committee composition violates school proceedures is also an ad hominem attack, respectively. The lukers may wonder if any of the Creationists even know what an ad hominem attack is.