It is not the business of the ACLU nor the federal government. The disclaimer may or may not be boneheaded but federal courts putting their collective noses in where they don't belong is boneheaded.
Bingo! I'm surprised that more people on this forum don't see that as the real danger here.
My stance might surprise you, but I think the ACLU was both right and wrong.
On a substantive level, dissing evolution as a theory is the same as dissing gravity as a theory. The word means something different in scientific parlance than it does in conservation among the general public.
I think evolution is reality, but that's not really relevant at the moment.
I think if the Cobb County school district wants to teach only Creation Science or its clone, Intelligent Design, they should be able to. I see no federal role in state education.
Unfortunately, the state of the law is such that there is a federal role in state education, and the state of the law is that religion is a verboten topic in public schoolrooms.
That's not something new. Given those legal realities, this case was very easy to predict.