What is the source of the poll that says that only 28% of Americans believe in evolution? I find that almost impossible to believe. What it truly a nation-wide poll, or just some little segment deep in the Bible-belt? (Having said that, I sat in a Sunday school class to hear the leader say "Can you believe there are actually people out there who believe we descended from apes?" as if it were shocking. Rather than raising my hand and saying "Yeah, and I'm one of them!" I found a different class, and in fact no longer attend that church. But in relating that story to others, the result was universally shock. It wasn't that 3 out of 4 people agreed with the Sunday School leader and only 1 in 4 agreed with me. Everyone was shocked.)
I'd like to point out that just about every time some school district has mandated teaching "alternate theories" to evolution, they have been voted out of office.
(P.S. I write this not only as an American, but as one who is far more "religious" than most people would guess. And I'm 100% sure that God isn't mad at me for not taking Genesis literally!)