I tend to go to churches that are a bit more conservative about their faith, even though I am totally not haha, and most of the under-40 crowd believes in theistic evolution. I think if you take away the older religious folk, the number would be much lower. At least I think so. Most Christians don't take the Genesis account literally these days.
If you are a Christian and happen to say that you believe in evolution to a super-literal Bible thumper, though... Watch out! You will learn how much "Satan is working on your mind."