That is probably because it was conceived and done by pretty stupid people.
Not so stupid, but very clever.
They phrased the questions precisely to achieve the answers they wanted.
I even suspect they had the conclusions and percentages all determined beforehand.
The only people I ever recall being obsessed over creationism, 7 days and 10,000 years are professional atheists, activists, pro-sodomy crowd and the pervert GLBTMDY crowd.