http://news.gallup.com/poll/210956/belief-creationist-view-humans-new-low.aspx indicates that 38% chose “God created humans in present form within last 10,000 years” (versus 38% “Humans evolved, God guided process” and 19% “Humans evolved, God had no part in process”).
http://www.pewinternet.org/2016/10/04/the-politics-of-climate/ says that, for the statement that “Earth is warming due to human activity”, 15% of conservative Republicans agree, versus 34% of moderate/liberal Republicans, 63% of moderate/conservative Democrats, and 79% of liberal Democrats.
I.e. young earth creationism and global warming skepticism are more popular than just fringe viewpoints.