4. Spina bifida in Neolithic England. The barrows around Stonehenge and similar Neolithic religious monuments are dated to around 2,000 to 5,000 years ago. Thus they should have around half of the degradation we have. Note that creationists generally agree with those dates, since we have roman and other records showing that refer to them as past civilizations. The bodies in the barrows have a hig proportion of Spina Bifida (a birth defect). If there has been degradation since the fall, then ancient birth defects should be much lower, not much higher.
Isn't Spina Bifida caused by a nutritional deficiency during gestation? That is why pregnant women hawk down the folic acid.
Of course, biblical creationists are committed to belief in God's written Word, the Bible, which forbids bearing false witness; --AIG (lest they forget)