Bottom line is that 4 in 10 Americans believe God created Adam and Eve in the Garden of Eden a few thousand years ago. Gallup doesn't ask, but I presume many, if not most of these respondents also believe in a young-Earth. In other words, they completely reject virtually all of modern science - once you throw a young-Earth in there, geology and astronomy are also out along with biology. In addition, to support a young-Earth creationist (YEC) model, chemistry and physics don't work either (e.g. the superfast plate tectonic model of some YECs or the "vapor canopy" model for flood waters is complete nonsense according to rather simple thermodynamics).
The way YECs explain things is much like the cartoon below.
I guess one could say there's good news in that 40% is the lowest it's been in decades. It is rather sad, however, that 4 in 10 Americans believe scientists are liars engaged in a global conspiracy. It's a good thing science is not decided by popular vote.