A Christian’s belief in millions of years totally contradicts the clear teaching of Scripture. Here are just three examples:
Thorns. Fossil thorns are found in rock layers that secularists believe to be hundreds of millions of years old, so supposedly they existed millions of years before man. However, the Bible makes it clear that thorns came into existence after the curse: “Then to Adam He said, ‘Because . . . you have eaten from the tree of which I commanded you, saying, “You shall not eat of it”: Cursed is the ground for your sake. . . . Both thorns and thistles it shall bring forth for you’” (Genesis 3:17–18).
Disease. The fossil remains of animals, said by evolutionists to be millions of years old, show evidence of diseases (like cancer, brain tumors, and arthritis). Thus such diseases supposedly existed millions of years before sin. Yet Scripture teaches that after God finished creating everything and placed man at the pinnacle of creation, He described the creation as “very good” (Genesis 1:31). Certainly calling cancer and brain tumors “very good” does not fit with Scripture and the character of God.
Diet. The Bible clearly teaches in Genesis 1:29–30 that Adam and Eve and the animals were all vegetarian before sin entered the world. However, we find fossils with lots of evidence showing that animals were eating each other—supposedly millions of years before man and thus before sin.
-Ken Ham, Answers in Genesis