I think we're talking about a small percentage of Christians who could be classified as "Biblical literalists".
Apparently that school of thought believes the Bible implicitly states the world to be only 5000 years old. Obviously, that is not true. The story of Noah obviously cannot be true, either.
There is always a way for people of faith to reconcile evolution science with their faith, but not if they insist every word of the Bible is absolute truth.
That they react so strongly, and consistently, against science is more an indication of their weak faith than a lack of intelligence, IMO.
