… dinosaur bones that are supposedly millions of years old have been found to show evidence of arthritis, abscesses, and osteoarthritis. Evidence of cancer and other diseases have also been found in fossil bones. So, if a Christian believes the fossil record was laid down millions of years before the first two people, then they've accepted that there were all sorts of horrible diseases in this world before sin. How could God have described such a world as VERY GOOD?... No - our answers in Genesis make it clear that there were NO diseases before sin. This is another reason why Christians cannot believe in millions of years to form the fossil record.
Did Adam have a Bellybutton?: And other tough questions about the Bible (2000)