Creationists are often extremely bad with confirmation bias because they need anything to reaffirm such a weak theory. And the only reason they defend it tooth and nail is because it is directly linked to their religion. Their religion serves as such a massive piece of their overall worldview that it is nearly impossible to extricate them out of irrational belief without causing tremendous cognitive dissonance in the process.
What's worse, evolutionists are made out to be Satan's little helpers, albeit through trickery. That creationists are confronted with physical evidence and empirical data often only serves to confirm for them what their pastors and their apologetic websites informed them -- that it can't be trusted and don't be enticed by it.
But this shouldn't only point the finger at creationists in all fairness. It is human nature to hold a bias to some degree. The idea is to look at all things objectively and not dismiss inconvenient evidences but to detatch oneself until a fair and final verdict can be made.
"Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passions, they cannot alter the state of facts and evidence." --John Adams
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