Creationists have a huge emotional investment in the creation story that inhibits their ability to reason. And that investment is based on fear. They believe that if their faith in the validity of the story does not waver they will be rewarded with eternal life, forever reunited with their loved ones in heavenly bliss with an occasional stint in the heavenly choir. If they allow this happy vision to be corrupted by doubt they will be denied entrance to this heavenly wonderland despite all their years of good, solid faith. That is such a heavy burden and one I’m grateful not to bear. It would truly be frightening.