The sad thing to me is that the low level of "acceptance" of evolution by Americans shows to me fundamental flaws in our education system. When I was in high school and taught evolution, I was basically taught it as "this is how it is", and also with some examples of the evidence for it, but it's not hard for me to see how many people frame evolution as a "some evidence is for it, some evidence is against it" type of question given how it is taught in most high schools. It was only when I got to college that I was really exposed to how evolution is the absolute basis of pretty much all biological understanding, and that if it weren't true, that basically none of our command of biology (e.g. modern medicine) could work.
I'm not necessarily saying high schools have the opportunity to go into that much depth, but it would not be hard, for example, to tie in evolution into lots of different disciplines to see why it's so important, instead of just kind of throwing it out there as one more piece of information students should "believe".