I just wanted to add, that I live in Bible Belt, pretty far into the Deep South. I went to a high school with no more than 300-400 students with a future farmers club, general agg clubs, and more Christian affiliated clubs than I can remember (Crusaders Club, Christian Spirit, Christ Society, etc).
Creationism was never taught in our textbooks.
We had crucifixes and our moments of silence where teachers would pray to themselves in front of the class... but not a word on the Christian god was in our textbooks. I remember being taught about Darwinism and all that goes with it, but never a thing about God.
In fact, I went to Christian school as a child up to junior high school and I wasn't even taught "scientific creationism" there. But evolution wasn't taught there, either... but it was a privately funded school that didn't rely on public money. It also didn't have more than 150 students in the entire school from kindergarten to senior year.
I went to two other public schools, middle school and transferred to a bigger high school a few cities away and was never taught creationism. I live in super redneck county where everyone listens to country music, goes hunting, four wheeling, owns a couple of dogs, and has a truck. Including myself, except for the hunting part.
I really don't understand where this whole the US not teaching "natural selection" comes from.