Maybe I've just been dense and it never registered before, but I think I finally understand why so many evangelical Christians resist and oppose evolution. And it's not the reason you might think. In a recent
Time cover story on the evolution wars, the magazine included short interviews with four people on the question, "Can you believe in God and evolution?" Albert Mohler, president of the Southern Baptist Theological Seminary, says no
arguingFor one thing, there's the issue of human "descent." Evangelicals must absolutely affirm the special creation of humans in God's image, with no physical evolution from any non-human species. Just as important, the Bible clearly teaches that God is involved in every aspect and moment in the life of His creation and the universe. That rules out the image of a kind of divine watchmaker.
Before proceeding, let me again reiterate that I am an evangelical Christian by faith and a physicist by education.
Mohler makes two points. The first is that Christians must believe that humans had a special creation that makes them unique and distinct from all other animal species. I think we have to agree Biblically that man has a unique place in creation, but I do not see that that precludes a non-human ancestry.
The second point is what's interesting. He is attempting to debunk a straw man, I think, which is that Christian evolutionists believe in some sort of deism, where God accomplished creation by setting the rules for evolution then stepping back and watching it happen. It's a straw man because I do not believe that's what most Christian evolutionists believe. We embrace the fact that God is "involved in every aspect and moment in the life of His creation and the universe." While that does indeed rule out the divine watchmaker, it is also beside the point.
But it is illuminating. In thinking about this, about a comment in a letter to the editor in
Newsweek, and about a comment I heard in church recently, I realize the basic issue is randomness. Evolution suggests life evolved through a series of random mutations in simpler organisms. Randomness suggests, well, randomness, whereas creation suggests order and method. Hence, the two are inexorably opposed, right?
I am glad these anti-evolutionists have not apparently studied modern physics. Randomness is the cornerstone of quantum mechanics, which is founded on the assumption that nature works through probabilism, not determinism. Here's the idea. In classical physics, all the way back to the Greeks, nature was assumed deterministic. That means if I repeat an experiment 1000 times under the same conditions, the exact same result will emerge 1000 times. If I know the initial conditions and the forces involved, I know exactly what will happen. Probabilism, on the other hand, says I have no idea what will happen each time I run the experiment. There are any number of possible outcomes, each with a certain probability of happening. The best I can say is how often I would expect to see some given outcome.
This is necessarily abstract and hard to understand if you haven't studied physics. I will try to illustrate. If I pick up a pencil and let it go, it will fall due to gravity. In a deterministic universe, all I need to know is the height of the pencil to determine exactly what will happen. I can calculate exactly how long it will take to hit the ground, and the speed at which it will be moving when it does hit. More importantly, I can calculate the exactly trajectory of that pencil, marking its exact position at every moment during the fall. And if I do the experiment 1000 times, I will get the exact same results.
In the quantum realm, it is much more complex. I have to consider the straight line path, yes. But I have to consider a trajectory with a single loop, one with two loops, one where it makes a 90 turn, etc. (This sounds weird, I know. At the size scale we are talking about, the probability of each of these paths is 0, except the straight line path, which is why we don't worry about quantum effects in our everyday world. But a proper quantum solution would have to consider all these. The example illustrates the process involved in understanding interactions at much smaller size scales where quantum effects do matter.) Each trajectory has a probability, so repeating the experiment 1000 times, I can estimate how often I would expect to see each path. The same thing will not necessarily happen each time. (Quantum also has the uncertainty principle which says I cannot know the position and momentum of the pencil simultaneously, and other fun effects.)
A more realistic example would be electron-electron scattering. As we know, like electrical charges repel each other, which means an electron flying past another will be deflected. In the quantum world, how would this be explained? The theory is called quantum electrodynamics (QED), perhaps the best tested theory in physics. To explain what happens, one has to determine all the possible interactions, and add up their probabilities. So, a photon (the carrier of the electromagnetic force) could simply be exchanged between the two electrons. Or, a photon could be emitted by one, spontaneously produce a virtual electron/positron pair which then annihilate to go back to one photon. Or two photons could be exchanged. Or there could be multiple virtual pairs. Any number of interactions are possible. (These are typically expressed through Feynman diagrams which represent terms in a series expansion of the equations of QED.) So the probability for each interaction is determined and from this a model of exactly how the electron-electron scattering occurs is derived.
It is crucial to understand that this probabilism is a fundamental property of nature, not some mathematical tool. In classical physics, there is a branch called statistical physics which looks at things like the physics of gases. Probability is involved there as well, but only as a simplification to the impossible task of solving the millions of equations, each of which would be assumed deterministic in principle. In principle, one could solve the equations of motion for every gas molecule, but that's just not realistic because there are so many and the interactions are so complex. Instead, the scenario is simplified to a statistical expression. Out of practical necessity, we give up trying to understand the properties of an individual molecule and instead try to understand the properties of the gas as a whole instead.
That is not the same thing as quantum which asserts this probabilism as a fundamental property of nature. In quantum we give up trying to understand the motion of a single electron around a nucleus because it is fundamentally not possible to understand that motion. The uncertainty principle tells us that the better we know the momentum of an electron, the less we know its position, and vice versa. Even attempting to make a measurement changes the state of what we're measuring.
I don't know how many people have made it this far but I'll press on with the point I'm trying to make. It seems to me that at the core of intelligent design is a resistance to the notion of randomness. The ID supporters want to remove the random mutations of evolution with a more orderly process guided by a designer. This is very similar to the debate in the physics community in the early 20th century when quantum physics began taking hold. Many physicists rejected quantum for exactly the same reason. Einstein and Niels Bohr had a celebrated exchange of letters arguing this philosophical point, with Einstein making the famous comment, "God does not play dice with the universe."
Randomness is not simply an element of evolution. It is a fundamental property of nature. To resist evolution because it is makes use of random processes is to also resist all of modern physics.
So, are randomness and design in conflict? This is the question at the core of the ID movement. As a Christian, I believe, as Mohler does, that "God is involved in every aspect and moment in the life of His creation." As a scientist, I have learned that God's involvement with creation is manifested through processes expressed and understood in the natural realm as random processes. Instead of fighting what science reveals about God to make God fit into some preconceived box, Christians should accept what God is showing them. As I wrote
before,
Rather than fight against scientific discovery, Christians should be embracing science as a means of further understanding the mind and ways of God. The Bible tells us that God is understood through creation (Rom 1:20). So why do they want to quash that understanding of creation so much?
Labels: intelligent design