Earlier quoted context omitted.
Well, look at the figures for percentage of people who believe something really whacky: creationism. Something like 40% ( http://www.huffingtonpost.com/2010/12/20/40-of-americans-sti... ). It's going to be hard to have a national curriculum without either watering down subjects like biology or US history to the point that they're totally useless, just rote memorization of falsehoods.
Really, simply believing in creationism does not conflict with most science, even biological science, and certainly not with US history. Of the 40% who believe in creationism (accepting your claim, though the source I'd certainly not consider unbiased), most have mainstream religious beliefs about the origin of the universe, earth, and life, but do not dismiss most of what science has learned in fields like medicine,…
To the contrary, taking the Sunday school story (it's not really the Bible story) of creation seriously as an explanation for the world's origin or the origin of species requires willfully massive amounts of scientific evidence.
http://www.talkorigins.org/faqs/comdesc/
http://pubs.usgs.gov/gip/geotime/age.html
http://www.astro.ucla.edu/~wright/age.html
http://www.psychologytoday.com/blog/the-playing-field/201005...
If someone who takes the Sunday school story of creation seriously has sole influence on a school curriculum, that will be a lousy school curriculum about most areas of science. That said, I support the liberty of parents to direct the education of their own children while their children are minors, believing with John Stuart Mill that "A general State education is a mere contrivance for moulding people to be exactly like one another: and as the mould in which it casts them is that which pleases the predominant power in the government, whether this be a monarch, a priesthood, an aristocracy, or the majority of the existing generation in proportion as it is efficient and successful, it establishes a despotism over the mind, leading by a natural tendency to one over the body. An education established and controlled by the State should only exist, if it exist at all, as one among many competing experiments, carried on for the purpose of example and stimulus, to keep others up to a certain standard of excellence." On Liberty (1859), pp. 190-91. But within the framework of pluralism in provision of primary education, I strongly support government-funded schools using the best available evidence in designing curricula in science, mathematics, history, and really any subject, and that takes creationism out of the science curriculum.
(Basis of knowledge: I grew up in a religious denomination that promoted belief in creationism, and had a childhood friend, an all-but-Ph.D. electrical engineer, who grew up in a denomination that demanded belief in creationism. He took me to "creation science" conferences beginning at high school age, and I have read much from all sides on theories of the origin of humankind, the earth, and the universe. Creationism simply has no leg to stand on scientifically. I don't require my homeschooled children to believe in creationism, but rather read aloud to them books like Why Evolution is True by Jerry Coyne and The Greatest Show on Earth by Richard Dawkins, so that they are more familiar with scientific evidence than most of their neighbors who attend the local public schools.)