Why creationists disbelief in evolution, it's religious dogma
Many people in the religious rightwing state that they don't believe in theories. They almost always use this in opposition to evolutionary theory. Indeed, they often use the internet to state this opinion. The internet is the product of relativity theory. Quantum mechanics theory. Electro-magnetic theory. Of course, nobody questions these theories, because they aren't assumed to be a threat to anyone's personal religious beliefs.
Some question evolutionary theory, because it is assumed that it does. Evolutionary theory has given us better vaccines, because of knowledge of resistance to vaccines, forces scientists to develop newer and better ones. This kind of knowledge is the foundation of modern biology. I assume these people refrain from vaccines because they don't want to use any "theories"?
Yes, evolution doesn't offer anything new except facts, observations, experiments and scientific knowledge. It is built on certain facts such as that species aren't random in the geological layers. Mammoths aren't found with dinosaurs. It is built upon facts such as that there are species of cave fish with non-working eyes, which make sense under evolutionary biology because they no longer need functioning eyes within caves.
The simple fact is that people disbelieve in evolution because they don't want it to be true. If they felt the need for quantum mechanics or relativity theory not to be true, they would spend millions of dollars in efforts to promote, "intelligent pushing down" theory to explain away relativity or gravity.
It is up to us, Americans who support reason and science to ensure that religious dogma, of a few, doesn't become law. If not, than we might go back to the day when volcanos and tornados and rainstorms were explained though the whims of gods. Talk Origins is an excellent website in support of sound knowedge of evolution and biology.