People don't give up their worldviews easily. No one gives up a worldview easily or it probably wasn't a worldview they cared about very much. A worldview isn't a worldview because it proves one thing, but because it proves everything. G.K. Chesterton put it pretty well;
So, first off, the present state of affairs is we're asking them to take this thing that, for them, proves everything (I'll try not to sound too postmodern when I say that ), for a theory that just proves something. Scientifically, it makes perfect sense. But in the economics of that person's worldview, it's an unfair trade. In their mind, they're trading a system of values that works for them in exchange for some vague scientific theory.G.K. Chesterton wrote:It is very hard for a man to defend anything of which he is entirely convinced. It is comparatively easy when he is only partially convinced. He is partially convinced because he has found this or that proof of the thing, and he can expound it. But a man is not really convinced of a philosophic theory when he finds that something proves it. He is only really convinced when he finds that everything proves it.
If there is one man I think can really hit Creationism in the gut, it's Francis Collins. I don't know about other people, but for me, he just had to exist. He's not just a good Christian, he's a great one, and he's not just a good geneticist, he's a great geneticist. But when the same man presenting evidence for evolution is telling people to give up their gods, how do you think they're going to react? And how the hell could you blame them?
EDIT: Is it just me or does Francis Collins look AND sound like Ned Flanders