Yet some people just dont seem to be able to grasp such simple concepts.
Grasping the concepts is simple enough.
The problem here is with people who refuse to grasp the concepts, because they find it threatening to their religion or to their income.
... but half of the US believes this bullshit.
I don't think that's true. What probably is true, is that half of the US are unwilling to take a stand against such nonsense.
Fundamentalism - the anti-American, anti-Christian branch of American Christianity