“I was experiencing on a personal level what philosopher Daniel Dennett has observed: Darwinism is a ‘universal acid’ that ‘eats through just about every traditional concept and leaves in its wake a revolutionized worldview.’”

Here, Strobel quotes from Daniel Dennett, hailed near the beginning of the 21st century as one of the “four horsemen” of the New Atheist movement. Strobel is articulating the way that Darwinism acted as the key factor in convincing him that the nominal faith of his childhood was false and that scientific naturalism—with its complete rejection of the supernatural—must therefore be true. This is a common warning among creationists, who counsel wariness of the theory of evolution not only for ostensibly scientific reasons but also because it could herald the destruction of one’s entire faith-commitment; Strobel adds credence to this observation by having it come not from a creationist, but a prominent atheist.

“Nobody can claim that Darwin’s tree is an accurate description of what the fossil record has produced. Protestations from Darwinists aside, the evidence has failed to substantiate the predictions that Darwin made.”

This quote represents part of Strobel’s critique of Darwinism. He begins his interviews by taking a negative tack, aiming to show that Darwinism has failed to substantiate his own claims, before shifting to a positive argument for intelligent design in the subsequent chapters. In this quote, Strobel is pointing out that the fossil record does not match the expectations one would have given Darwin’s theory, in which an abundance of clearly transitional forms should appear. Critics, however, would argue that the fossil record is not the only “evidence” that substantiates Darwinian evolution and that Strobel fails to engage with the full weight of the scientific theory.

“I was left with an origin-of-life experiment whose results have been rendered meaningless; a Tree of Life that had been uprooted by the Biological Big Bang of the Cambrian explosion; doctored embryo drawings that don’t reflect reality; and a fossil record that stubbornly refuses to yield the transitional forms crucial to evolutionary theory. Doubts piled on doubts.”

After assessing some of the traditional claims associated with Darwinian evolution, Strobel reflects that the paucity of the data associated with them has made him reconsider his commitment to atheism. Strobel’s own narrative arc is an important part of his literary structuring of the book; he wants skeptics and atheists to see him as coming from a common starting point and thus to prove that it is possible to be convinced otherwise. His use of irony supports this framing of The Scientific Method as a Means of Assessing Evidence for Supernatural Realities. The “Tree of Life” is not merely a representation of evolutionary history but also an image in the biblical story of creation, while the Big Bang is a scientific theory. On the face of it, the passage therefore seems to suggest the supplanting of religion by science; Strobel suggests that the theistic implications of scientific theories have “uprooted” his “faith” in Darwinism.

“[A]cross a wide range of the sciences, evidence has come to light in the last fifty years which, taken together, provides a robust case for theism. Only theism can provide an intellectually satisfying causal explanation for all of this evidence.”

This is a quote from Stephen Meyer’s first interview, in which the broad contours of the case for intelligent design are laid out. Here he introduces the readers to one of the central points of the book, a claim that lies at the center of the intelligent design movement: namely, that the momentum of emerging scientific evidence has shifted in just the past half-century. Meyer contends that the skepticism with which intelligent design is often met is rooted in the older sense, now outdated, that the weight of scientific evidence points away from God. That reality, Meyer claims, has shifted as human knowledge has expanded and deepened. This arguably misrepresents the roots of resistance to intelligent design, which is viewed skeptically even by many scientists who are Christian.

“‘In short,’ he added, ‘naturalism is on hard times in cosmology; the deeper you get into it, the harder it is to get rid of the God hypothesis. Taken together, the Big Bang and general relativity provide a scientific description of what Christians call creation ex nihilo—creation out of nothing.’”

Here Meyer refers to a traditional Christian doctrine—creation ex nihilo—that for many centuries was lambasted as absurd by skeptics, who thought it much more reasonable to assume that the universe had simply been around forever than to think that it had a beginning, effectively emerging out of nothing. Now the accepted mainstream scientific theories have overturned that old skepticism and shown that the universe very likely did have a discrete beginning, just as Christian theology always taught.

“This is a form of practical reasoning that we use in life all the time. It says that if we want to explain a phenomenon or event, we consider a whole range of hypotheses and infer to the one which, if true, would provide the best explanation. In other words, we do an exhaustive analysis of the possible explanations and keep adding information until only one explanation is left that can explain the whole range of data.”

In this quote, Meyer is describing the mode of inferential argumentation by which, he says, the logical reasoning of the case for intelligent design progresses. This is usually called an abductive argument: an inference to the best available explanation. To critics who label intelligent design as unscientific, Meyer contends that this mode of reasoning is commonly used in the sciences, as well as in many other domains of human knowledge.

“[T]he argument has three simple steps: ‘Whatever begins to exist has a cause. The universe began to exist. Therefore, the universe has a cause.’ Then you can do a conceptual analysis of what it means to be a cause of the universe, and a striking number of divine attributes can be identified.”

Here, William Lane Craig is laying out the basic features of his kalam cosmological argument. He believes that the first premise is axiomatic and that most people will agree with it simply based on the uniform agreement of all human experience; the second premise, he sees as conclusively backed up by modern cosmological models. This leads inextricably to the conclusion, and Craig takes pains to point out that a necessary cause for the whole universe, as framed by this syllogism, would have to be transcendent of material reality.

“Back then, Christians had to maintain by faith in the Bible that despite all appearances to the contrary, the universe was not eternal but was created out of nothing a finite time ago. Now, the situation is exactly the opposite. It is the atheist who has to maintain, by faith, despite all of the evidence to the contrary, that the universe did not have a beginning a finite time ago but is in some inexplicable way eternal after all. So the shoe is on the other foot. The Christian can stand confidently within biblical truth, knowing it’s in line with mainstream astrophysics and cosmology. It’s the atheist who feels very uncomfortable and marginalized today.”

Echoing the earlier point that Meyer made, Craig claims that the tides are shifting in science and culture, arguing that the emerging evidence of physics and cosmology appears to point strongly toward design, whereas the limited prior data seemed on the surface to suggest an opposite inference. Though Craig may overemphasize the “marginalization” of atheism for rhetorical purposes, his broader assessment of the situation is backed up by the proliferation of speculative models attempting an explanation for the universe’s apparent design features, from the multiverse theory to the simulation hypothesis.

“As recently as twenty-five years ago, a reasonable person weighing the purely scientific evidence on the issue would likely have come down on the side of skepticism. That is no longer the case […]. Today the concrete data point strongly in the direction of the God hypothesis. It is the simplest and most obvious solution to the anthropic puzzle.”

This is a quote from Patrick Glynn—not one of Strobel’s interviewees, but representative of Strobel’s broad use of quotations from many other scientists and philosophers, both theists and atheists. This quote agrees with the assessment of both Meyer and Craig on the turning of the tide in modern science and culture, and it alludes to the idea of Occam’s Razor, which stipulates that the simplest and most straightforward explanation is probably the right one. In this case, Glynn is saying that the simplest explanation for the universe’s apparent design is the existence of God—a single necessary being—rather than more complicated scenarios, such as an infinite array of unprovable other universes.

“In light of the infinitesimal odds of getting all the right dial settings for the constants of physics, the forces of nature, and other physical laws and principles necessary for life, it seems fruitless to try to explain away all of this fine-tuning as merely the product of random happenstance.”

Here, Strobel summarizes his conclusions regarding The Fine-Tuning of the Universe as Evidence for Design. The fact that even one of the values would fall into such a vanishingly narrow range for life-oriented outcomes would be remarkable, Strobel suggests, but he also calls to attention the fact that there are many such “dial settings,” each of them operating on similarly restrictive odds. The rhetorical implication is that it would be silly for the reader to wave it all off as sheer chance.

“Theists have nothing to fear from the idea that there may be multiple universes. There would still need to be an intelligent designer to make the finely tuned universe-generating process work. To modify a phrase from philosopher Fred Dretske: these are inflationary times, and the cost of atheism has just gone up.”

This quote comes from Robin Collins, who is addressing one of the possible rebuttals of the fine-tuning argument for intelligent design, namely the multiverse theory. After noting that no experimental evidence yet points in the direction of there being multiple universes, Collins notes that even if there were, it would not shake the design-oriented conclusions of the fine-tuning argument; it would simply push the need to explain the system’s cause one step further back.

“[The anthropic evidence is] not conclusive in the sense that mathematics tells us two plus two equals four […] Instead, it’s a cumulative argument. The extraordinary fine-tuning of the laws and constants of nature, their beauty, their discoverability, their intelligibility—all of this combines to make the God hypothesis the most reasonable choice we have. All other theories fall short.”

This passage clarifies the epistemological operations of the case for intelligent design. While it cannot give one mathematical certainty, Strobel argues, it can point toward the most plausible solutions. The fine-tuning data does not explain itself or give a direct answer as to its cause, but the surprise and wonder it evokes are nevertheless indicative that something significant is at work behind the curious alignment of all these physical values. Strobel’s catalog of features of the universe adds to the impression that the conclusion is inevitable based on the sheer amount of evidence.

“Earth’s location, its size, its composition, its structure, its atmosphere, its temperature, its internal dynamics, and its many intricate cycles that are essential to life—the carbon cycle, the oxygen cycle, the nitrogen cycle, the phosphorus cycle, the sulfur cycle, the calcium cycle, the sodium cycle, and so on—testify to the degree to which our planet is exquisitely and precariously balanced.”

This quote sums up the “privileged planet” argument propounded by Guillermo Gonzales, showing how it connects to the theme of fine-tuning. It makes note of not just the fine-tuning aspects of Earth’s position in a habitable zone, but also of the many finely tuned features of Earth’s own physical makeup, for which a disruption to any piece would necessarily preclude Earth from sustaining life. Once again, a list of features, here pertaining to Earth, serves a rhetorical purpose by evoking a sense of overflowing evidence.

“When I took this together with all of the various ‘serendipitous’ circumstances involving our privileged location in the universe, I was left without a vocabulary to describe my sense of wonder. The suggestion that all of this was based on fortuitous chance had become absurd to me. The tell-tale signs of design are evident from the far reaches of the Milky Way down to the inner core of our planet.”

Strobel here appeals to a sense of wonder at the extent of the universe’s finely tuned features. This appeal falls within a tradition of seeking scientific and mathematical truths by looking for the most beautiful, elegant, and wonder-evoking solutions. Physicists often remark on the surprising beauty of the universe’s fundamental equations, so it should come as no surprise that the vast array of its fine-tuning features would also evoke wonder, which Strobel harnesses for the purposes of his theistic argument.

“My conclusion, frankly, is that the universe was designed for observers living in places where they can make scientific discoveries […] There may be other purposes to the universe, but at least we know that scientific discovery was one of them.”

This is the second insight of Gonzales’s “privileged planet” argument: not just that Earth’s placement in the universe is advantageous for the presence of life, but that it is also advantageous for the progress of scientific discovery. If the design inference is true, this would appear to indicate that the universe’s designer wants life-forms to explore and learn about their environment.

“Darwin said in his Origin of Species, ‘If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.’ And that was the basis for my concept of irreducible complexity.”

Here, Michael Behe explains the fundamental premise behind his argument from molecular biology, as drawn from Darwin’s own assessment of his theory. Behe’s conclusion has been challenged in peer-reviewed studies, but he maintains (in The Case for a Creator and elsewhere) that those studies do not actually constitute an effective rebuttal of his case. Behe’s claims about “irreducible complexity” are central to Strobel’s presentation of The Complexity of Biological Systems Challenging Materialism.

“Right now, there’s only one principle that we know can come up with complex interactive systems, and that’s intelligence. Natural selection has been proposed, but there’s little or no evidence backing that claim. Some people had high hopes for self-organizational properties or complexity theory, but there’s no evidence that these can explain something as complicated as the cell. The only force known to be able to make irreducibly complex machines is intelligent design.”

In this quote, Behe appeals to the idea of an abductive argument, which assesses the evidence against a range of possible explanations and then chooses the explanation that best fits the data. While other explanations have been proposed for the specific complexity within the cell, Behe argues that none have demonstrated that they actually produce the desired results, leaving only one explanation—the simple observation that intelligent agents can design specified complexity—as the best available conclusion.

“My conclusion can be summed up in a single word: design […] I say that based on science. I believe that irreducibly complex systems are strong evidence of a purposeful, intentional design by an intelligent agent. No other theory succeeds; certainly not Darwinism.”

This is also a quote from Behe, in which he summarizes his view of the conclusion to be drawn from the debate between Darwinian evolution and intelligent design. Like all of the interviewees in Strobel’s book, he draws attention to the fact that it is the scientific data—not a prior commitment to a religious position nor an interpretation of biblical texts—that brings him to his conclusion.

“In short, no hypothesis has come close to explaining how information necessary to life’s origin arose by naturalistic means.”

This short quote draws attention to what Strobel characterizes as the continuing failure of origin-of-life science to explain the emergence of even the simplest forms of life on Earth. While many speculative theories have been proposed, the actual mechanisms and processes by which they might have resulted in life remain unproven. Intelligent design theorists believe that the vast storehouses of ordered information needed to produce even the simplest self-replicating biological systems effectively preclude any naturalistic scenario.

“Once you allow intelligent design as an option, you can quickly see how it accounts for the key features of the Cambrian phenomenon. No other entity explains the sudden appearance of such complex new creatures. […] No other entity can create the complex and functionally specific information needed for new living forms. No other explanation suffices.”

This is a quote from Stephen Meyer, drawing attention to the dynamic fossil records from the so-called “Cambrian explosion,” where multiple new animal body forms appeared all at once, without transitions from earlier forms. While fossil records are by nature incomplete and any gaps within them can never be more than an argument from silence, Meyer implies that the sheer number of new animals and anatomical features that emerged at this time makes such a gap surprising. Darwinian evolution does not, in Meyer’s view, sufficiently explain this fossil evidence, but the work of an intelligent designer could.

“The conclusion was compelling: an intelligent entity has literally spelled out evidence of his existence through the four chemical letters in the genetic code. It’s almost as if the Creator autographed every cell.”

Here, Strobel’s background as a journalist shows up in his prose. He draws the information-dense data of Meyer’s case for design in the biochemistry of DNA, and he uses the imagery of an author’s autograph to present it in an accessible way.

“And if the history of the universe is just a story of physical processes being applied to physical materials, you’d end up with increasingly complicated arrangements of physical materials, but you’re not going to get something that’s completely nonphysical [like consciousness]. […] However—and this is really important—if you begin with an infinite mind, then you can explain how finite minds could come into existence.”

This is J. P. Moreland’s summation of the intelligent design argument from consciousness, in which he argues that increasing complexification of natural materials cannot give rise to the emergence of consciousness. Such a result has never been directly observed by science, and some philosophers believe it to be impossible on the face of it. In Moreland’s view, then, the only way to get a nonphysical reality, like human consciousness, is to derive it from another nonphysical reality, like a transcendent creator.

“Looking at the doctrine of Darwinism, which undergirded my atheism for so many years, it didn’t take me long to conclude that it was simply too far-fetched to be credible. […] I was forced to conclude that Darwinism would require a blind leap of faith that I was not willing to make.”

Here, Strobel turns the tables on the common rhetoric exchanged between atheists and Christians. While atheists often accuse Christians of having to take a “leap of faith” in places where they have no evidence, Strobel is saying that that is actually the position that a Darwinian evolutionist must take in the face of a paucity of evidence for their theory.