Gallup has been asking representative samples of Americans since 1982 which of these three options comes closest to their own view:
God created man pretty much in his present form at one time within the last 10,000 years. [Creationist view]
Man has developed over millions of years from less advanced forms of life, but God guided this process, including man's creation. [Theistic evolution]
Man has developed over millions of years from less advanced forms of life. God had no part in this process. [Naturalistic Evolution]
Think of how you would answer this question.
Then estimate what percentage of Americans would choose each of these options.
The actual responses of American have remained pretty stable over the past quarter century. Here are the typical percentages:
Creationist view 47%
Theistic evolution 40%
Naturalistic Evolution 9%
Most people are surprised at this distribution. Most educated people, in particular, have a hard time accepting the idea that half of Americans would take the young-earth creationist position over other views.
I am impressed at how large the middle position, the theistic evolution position, is. If you force people to choose between creation and evolution, most people in a religious country will choose creation. If you give people a middle option, a sizable number will choose that. The constituency for naturalistic evolution, by contrast, is the same size as the constituency for "no religion."