In this case: creationism.
|Source: National Geographic|
In 2013 another survey asked, “Humans and other living things have evolved over time.” Only 43% of those who identified as Republicans agreed. This was down from 54% in 2009. An 11% decline in 4 years.
Among Democrats 67% answered true while 65% of Independents agreed. Pew’s researchers said party differences remained when other factors — such as the racial and ethnic composition of the political groups, and religious and educational background — were taken into account.
That's pretty bad, but it might explain why other silly beliefs have taken hold in US society.
Evolution Less Accepted in U.S. Than Other Western Countries, Study Finds