In most wealthy countries, people tend to believe in evolution. The US is an exceptional lonely dot far, far below the others, as this chart from the now-defunct webcomic Calamities of Nature shows:
How many Americans believe in evolution depends slightly upon how you frame the question. Tony Piro, who created this chart, used a question that refers to human beings developing "from earlier species of animals." Other polls that simply ask whether humans have evolved over time (without referring to animals) find a slightly higher percentage of Americans believing in evolution, around 60 percent. That would still make the US an outlier among rich countries, though.