"Do you believe in evolution" is not a yes/no question, despite the fact that it's presented as such. "I do not believe we descended from monkeys" and "I do believe that MRSA evolved because of our use of antibiotics" are positions that are easily held by lots of Americans. On the face of it, the former is a creationist viewpoint while the latter is an evolutionist viewpoint. But keep in mind - "Intelligent Design" allows you to say "I believe that evolution is all part of God's plan" and, by definition, you're a creationist. That's where "evolution" and "America" comes off the rails - most Americans are perfectly fine believing that there's science involved in their lives, but they get itchy when you say "there's nothing but science in your lives." A wholehearted acceptance of the factuality of evolution means a wholehearted acceptance that Big Sky Father has less power than we were taught at Sunday School so most Americans prevaricate. And if you prevaricate on the survey, you're a creationist.