...Species going extinct and genetic disease are consistent with a cursed earth.
Did man "mutate" after the flood inorder for most to live without the diseases that can only survive within a man's body that must have been carried by those on the ark?
Species going extinct was not consistent with religion 300 years ago, when extinction was first proposed. Your assumption the you can discernt he clear and unambiguous intention of the Bible is just pride on your part. Other people in other times have made different interpretations.
More importantly, the record is not just of extinction, but of new creatures coming into being in succession. This was admitted by Christian geologists a hundred years before Darwin.