Fundamentalists say that the Bible must be trustworthy in everything it says – about nature, science, history, or any other topic – or else it isn’t trustworthy in what it says about God.
Let’s see what happens if we apply the same logic to the natural world.
The Bible says that the created things give reliable testimony to their Creator. In Romans 1:20, we read, “For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse.” And Psalm 19:1 says, “The heavens declare the glory of God; the skies proclaim the work of his hands.”
I think this may be a point worth making to young-earth creationists. Their arguments about the Bible and their arguments about the natural world directly contradict one another.
And don’t let them claim that in the case of the natural world the issue is interpretation of the witness that is borne, since no one at this point should find it at all plausible that reading the Bible does not involve interpretation.