Science and Biblical Authority

by Dr. Georgia Purdom on January 11, 2010
Featured in Answers Update

Why do Christians believe the Bible doesn’t serve as a foundation for biology, geology, and astronomy? Dr. Georgia Purdom, AiG–U.S., examines the issue.

Genetics, Evolution, and Creation

From gene duplication to beneficial mutations, more and more evolutionists are attempting to use discoveries in the field of genetics as proof for common ancestry of life on earth. In Genetics, Evolution, and Creation, Georgia Purdom (PhD, molecular genetics) examines these arguments and shows why they are not evidence for common ancestry.

As a scientist and Christian, I have come to the conclusion that the Bible serves as an essential foundation for understanding science in the past and present. While I would expect atheists to object to this concept, I find that even many Christians object. Why is that? Why do Christians believe the Bible doesn’t serve as a foundation for biology, geology, and astronomy?

In our recently published book Already Gone, the research shows that many “20 somethings” have left the church because they question the truthfulness of the Bible, especially as it concerns the age of the earth. As children, they were typically taught Bible “stories” in church. They were shown bathtub-shaped arks overflowing with colorful animals but no mention of fossils, rock layers, and animal kinds.

Curriculum publishers, Sunday school teachers, and parents failed to connect the Bible to the real world. So, these children learned that you go to school to learn about history and science, and you go to church to learn moral “stories” and spiritual truths.

Jesus Christ says in John 3:12, “If I have told you earthly things and you do not believe, how will you believe if I tell you heavenly things?” The earthly things can be categorized into areas such as biology, geology, and astronomy—and their foundation is in the book of Genesis. Biology and astronomy started in Genesis chapter 1 with the creation of plants on Day 3 and the sun, moon, and stars on Day 4; animals and man were then created. Also, geology must be understood in light of the account of the worldwide Flood cataclysm of Genesis 7.

Jesus’s words in John 3 help us understand that the Bible is the foundation for our understanding of the real world, and it can be trusted and is the ultimate authority no matter what it speaks on (from biology to salvation)!

Sadly, many children are being taught in schools and some churches not to trust God’s Word in Genesis. This leads them to question the truthfulness of all of Scripture, and as young adults, most decide Christianity is irrelevant—and they leave the church.

What are we going to do about it?

We need to be equipped to teach young people (and adults) to see and draw connections between the Bible and the world around us.

We need to be equipped to teach young people (and adults) to see and draw connections between the Bible and the world around us. This means educating ourselves in the basics of biology, geology, and astronomy—as founded in Scripture. This does not have to be a daunting task. We can be sure that our efforts will be well rewarded and blessed by the Lord (Proverbs 22:6).

Learning to answer your child’s and other people’s questions about science may be easier than you think. For example, I am often asked about the similarities between human and chimp DNA. The similarities are often used in many science textbooks and class lectures to support the idea of common ancestry. But a logical fallacy (something called “affirming the consequent”) is often committed with these types of arguments. (Don’t let those words put you off; follow me here.)

The argument is typically stated this way:

  • If humans and chimps share a common ancestor, then we should observe similar DNA.
  • Similar DNA is observed between humans and chimps.
  • Therefore, humans and chimps share a common ancestor.

But the DNA could be similar for reasons other than a common ancestor. So, the conclusion does not necessarily follow from the observations.1 Thinking correctly—and being able to spot when other people are not thinking correctly—will enable you to answer many questions related to science.

Answers in Genesis has published numerous resources that answer all kinds of questions, from chimp DNA to the geologic column to the big bang—and at a level anyone can understand.

Paul exhorts us in 2 Corinthians 10:5 to “demolish arguments” and “take captive every thought to make it obedient to Christ.” Get equipped and be prepared to give answers (1 Peter 3:15) that connect the Bible to science and the world around us, so that the next generation will defend God’s Word as the ultimate authority.


  1. Creationists sometimes commit the same logical fallacy by arguing that similarities in DNA prove God exists and created living things. Rather, similarities in DNA show the consistency of the evidence with the Creator God who created. The transcendental argument should be used to argue for the existence of God and His work in creation. See The Ultimate Proof of Creation.


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