The book is an impressive catalog of the innumerable design problems that the human body overcomes in order to function. Reading it with any degree of objectivity makes it very difficult to think that the body is merely the result of a long chain of fortuitous accidents over a billion or so years of genetic mutation and natural selection.
Indeed, it takes an enormous effort of blind faith in the ability of impersonal mechanistic processes to convince oneself that the human body came about without any input from a super-intelligent bio-engineer.
Of course, some might reply that it takes an enormous exercise of blind faith to believe that such an engineer exists, but if the preponderance of evidence points to intelligence as the cause of what we see in the human body, if the preponderance of evidence is best explained by an intelligent cause, then the only reason we have for ruling out such a cause is an apriori commitment to metaphysical naturalism.
Setting such commitments aside, the probability that any complex, information-rich mechanism (like the human body) would exhibit the features it does is greater if it is intentionally designed than the probability that these features arose through purely undirected and random natural processes, and since we should always believe what's most probable over what's less probable, the belief that the body was intentionally designed is the most rational position to hold.
Here's the excerpt from pages 49-50:
To be alive, each cell must perform thousands of complicated tasks, with both functional and process coherence. This includes…containment, special-purpose gates, chemical sensing and controls (for many different chemicals), supply chain and transport, energy production and use, materials production, and information and information processing.One has to be extremely uncurious and intellectually indolent not to be astonished at the incredible complexity and information-level of even the simplest cells in our bodies. And one must be intellectually negligent not to ponder whether it's within the power of unguided and unaided physics and chemistry to produce such a marvel.
What does it take to make these work? Designing solutions to problems like this is hard, especially given two additional requirements.
The first, orchestration, means the cell has to get all the right things done in the right order at the right times. The activities of millions of parts must be coordinated. To this end, the cell actively sequences activities, signals various parts about what to do, starts and stops various machinery, and monitors progress.
The second requirement is reproduction. As if being alive weren’t difficult enough, some of the body’s cells must be able to generate new cells. This imposes a daunting set of additional design problems.
Each new cell needs a high-fidelity copy of the parent cell’s internal information, all the molecular machines needed for life, and a copy of the cell’s structure, including the organelles and microtubules. And it needs to know which internal operating system it should use.
Once these are all in place, the cell walls must constrict to complete the enclosure for the new cell, without allowing the internals to spill out.
Somehow cells solve all these problems. Each cell is a vast system of systems, with millions of components, machines, and processes, which are coherent, interdependent, tightly coordinated, and precisely tuned—all essential characteristics of the cell if it’s to be alive rather than dead.
There remains no plausible, causally adequate hypotheses for how any series of accidents, no matter how lucky and no matter how much time is given, could accomplish such things.
Presently it even lies beyond the reach of our brightest human designers to create them. Human engineers have no idea how to match the scope, precision, and efficiencies of even a single such cell, much less organisms composed of many cellular systems of systems, each system composed of millions or billions of cells.
I'll have another excerpt tomorrow.