The following was written by Karl Giberson, the 5th person I interviewed during the Advent series. (If you’ve not listened to that conversation, do so. It’s excellent!) Check out how many thousands of comments this piece has generated (HERE) on the CNN Belief Blog!

CNN Editor’s Note: Karl W. Giberson, Ph.D., is vice president of The BioLogos Foundation and is the author or coauthor of seven books, including The Language of Science and Faith.

By Karl W. Giberson, Special to CNN

Jesus once famously said, “I am the Truth.”

Christianity at its best embodies this provocative idea and has long been committed to preserving, expanding and sharing truth. Most of the great universities of the world were founded by Christians committed to the truth—in all its forms—and to training new generations to carry it forward.

When science began in the 17th century, Christians eagerly applied the new knowledge to alleviate suffering and improve living conditions.

But when it comes to the truth of evolution, many Christians feel compelled to look the other way. They hold on to a particular interpretation of an ancient story in Genesis that they have fashioned into a modern account of origins – a story that began as an oral tradition for a wandering tribe of Jews thousands of years ago.

This is the view on display in a $27 million dollar Creation Museum in Kentucky. It inspired the Institute for Creation Research, which purports to offer scientific support for creationism.

And it’s hardly a fringe view. A 2010 Gallup poll indicated that 4 in 10 Americans think that “God created human beings pretty much in their present form at one time within the last 10,000 years or so.” (http://www.gallup.com/poll/145286/four-americans-believe-strict-creationism.aspx)

While Genesis contains wonderful insights into the relationship between God and the creation, it simply does not contain scientific ideas about the origin of the universe, the age of the earth or the development of life.

For more than two centuries, careful scientific research, much of it done by Christians, has demonstrated clearly that the earth is billions years old, not mere thousands, as many creationists argue. We now know that the human race began millions of years ago in Africa – not thousands of years ago in the Middle East, as the story in Genesis suggests.

And all life forms are related to each other though evolution. These are important truths that science has discovered through careful research. They are not “opinions” that can be set aside if you don’t like them.

Anyone who values truth must take these ideas seriously, for they have been established as true beyond any reasonable doubt.

There is much evidence for evolution. The most compelling comes from the study of genes, especially now that the Human Genome Project has been completed and the genomes of many other species being constantly mapped.

In particular, humans share an unfortunate “broken gene” with many other primates, including chimpanzees, orangutans, and macaques. This gene, which works fine in most mammals, enables the production of Vitamin C. Species with broken versions of the gene can’t make Vitamin C and must get it from foods like oranges and lemons.

Thousands of hapless sailors died painful deaths scurvy during the age of exploration because their “Vitamin C” gene was broken.

How can different species have identical broken genes? The only reasonable explanation is that they inherited it from a common ancestor.

Not surprisingly, evolution since the time of Darwin has claimed that humans, orangutans, chimpanzees, and macaques evolved recently from a common ancestor. The new evidence from genetics corroborates this.

Such evidence proves common ancestry with a level of certainty comparable to the evidence that the earth goes around the sun.

This is but one of many, many evidences that support the truth of evolution – that make it a “sacred fact” that Christians must embrace in the name of truth. And they should embrace this truth with enthusiasm, for this is the world that God created.

Christians must come to welcome – rather than fear – the ideas of evolution. Truths about Nature are sacred, for they speak of our Creator. Such truths constitute “God’s second book” for Christians to read alongside the Bible.

In the 17th century, Galileo used the metaphor of the “two books” to help Christians of his generation understand the sacred truth that the earth moves about the sun. “The Bible,” he liked to say, “tells us how to go to heaven, not how the heavens ago.”

To understand how the heavens go we must read the book of Nature, not the Bible.

The Book of nature reveals the truth that God created the world through gradual processes over billions of years, rather than over the course of six days, as many creationists believe.

Evolution does not contradict the Bible unless you force an unreasonable interpretation on that ancient book.

To suppose, as the so-called young earth creationists do, that God dictated modern scientific ideas to ancient and uncomprehending scribes is to distort the biblical message beyond recognition. Modern science was not in the worldview of the biblical authors and it is not in the Bible.

Science is not a sinister enterprise aimed at destroying faith. It’s an honest exploration of the wonderful world that God created.

We are often asked to think about what Jesus would do, if he lived among us today. Who would Jesus vote for? What car would he drive?

To these questions we should add “What would Jesus believe about origins?”

And the answer? Jesus would believe evolution, of course. He cares for the Truth.

The opinions expressed in this commentary are solely those of Karl W. Giberson.