This New York Times article takes on the creation/evolution debate by way of the Grand Canyon--specifically, the creationist rafting trips that one can take down the Colorado river. This quote is absolutely priceless:
"Diana Panes began questioning evolution, which she had studied in school like most everyone else, seven years ago when [her ten-year-old son] Andrew came home from school asking whether Genesis was fable or history, and about dinosaurs dating back millions of years. "I was gobsmacked," Mrs. Panes recalled. So she started reading, attending lectures, watching creationist videos. "I don't want to believe in fairy tales. I'm interested in truth," Mrs. Panes said."
So how did she answer those questions?
There is one philosophical point that I would like to make. Different thinkers (among them Hilary Putnam and Karl Popper) have pointed out different criteria for good science. One criterion on everyone's list is always coherence--that our beliefs should not contradict each other. Coherence has even been been made into a theory of truth, albeit a deflationist one, by relativists like hans who have given up on absolute truth. Since there can be no such thing as correspondence of beliefs with reality, the coherentists say, the best we can hope for is to generate as many beliefs as possible that don't contradict one other. We can't test them against something else, something external, so as we pick them up we just see if they fit.
The point that I want to make is that despite the fact that (1) we should aim for coherence, that (2) we often do aim for coherence, and that (3) coherence is an end of science, coherence has still never stopped anyone dead in their tracks. Nothing in your mind short circuits when you're presented with a belief that contradicts another of your beliefs--you have several options at this point, and there's no algorithm that tells you what to do. So, this is to say that even if a creationist's belief system is incoherent AS WELL AS in opposition to established science, there is still nothing that forces them to change their minds. They will only change their minds when...they decide to.