That's because it's really about ideology not "science". Using science to push an agenda is just smoke and mirrors to distract people from what's really going on. The problem you evos have is that too many people on FR are aware of your tactics and not fooled by it one bit.
I can count on one hand the number of evos who haven't revealed their hostility towards religion when the surface has been scratched.
I think you mistake the thrust of the hostility. The hostility is directed at those that try to push their 'religion' into the science class.
Kindly present your citations from high school text books that deviate from a discussion of science.
My Biology textbook from 1960, which I still have, doesn't even mention evolution. The word doesn't appear anywhere in the book. And I went to a very expensive private high school.
Since these Internet debates began I have collected several high school textbooks, looking for any examples of injecting non-science into the discussion of biology, and I can't find any. Perhaps you can cites some examples, giving us title, publisher, year and page numbers.