Your chart only included Turkey amongst Muslim nations and there was a big difference between the USA, 40% pro-evolution, and Turkey at 25%.
Also, your title's mention of American Christians implies that most who identify themselves as such, about 85% of its population, hold on to that belief. It's fundamentalist Christians who are the focus, not liberal Christians and moderates who tend to believe in evolution and outnumber the Fundamentalists.
Of course, the USA lags behind the secular minded Europeans because of its having a larger fundamentalist Christian presence but it is not fair to compare them to Muslim nations. Especially Turkey which is a more secular state than other Muslim nations.