The aspects of the universe and the Earth that exhibit characteristics of being designed. Richard Swinburne writes, "The probability of a hypothesis h on evidence e and background knowledge k is a function of its prior probability (P(h/k)) and its explanatory power (P(e/h.k))/P(e/k). … Even if one considers the intrinsic probability of theism to be low, it is still significantly greater than that of alternative fillings for the hypothesis h. Hence, the occurrence of certain phenomena raises the probability of God’s existence, if and only if it is more probable that those phenomena will occur if is a God than if there is not.
"To show that it is unlikely that the phenomena would occur unless there were a God, one has to show that it is unlikely that there is any complete explanation of the phenomena (e.g., scientific explanation) other than one which involves God’s agency."
The aspects of our universe where it exists with an abundance of extremely narrow parameters that allow the possibility of life is potentially indicative and logically pointing to the plausibility of an intelligent source.
- Cosmic microwave background radiation
- The mass and charge of electrons, protons, and neutrons
- the speed of light
- the rain of protons to neutrons
- the strong nuclear force
- the mass of the sun
- the orbit of the Earth
- the Earth's gravity
- the properties of the carbon atom
- Etc.
Science has shown us that life came about by a process (evolution). But if all the evidence of the probability of evolution is a priori (that is, unless there is a God) unlikely, then (by pattern of logical argument), it is to be inferred that God more plausibly brought them about. And we know from science that the occurrence of life is a rare event in the vast spaces and billions of years of history.
For life to exist as it does, crucial variables must be positioned within a very narrow range. While science can give a partial and incomplete explanation of why the universe is as it is with such narrowly defined constants, theism alone can give a plausible and sufficient explanation of why they are as they are.
Alvin Plantinga says, "So several of the cosmological constants are fine-tuned; how do we turn this into an argument for theism? The basic idea is that such fine-tuning is not at all surprising or improbable on theism: God presumably would want there to be life, and indeed intelligent life with which (whom) to communicate and share love. Of course this life could take many different forms (indeed, perhaps it has taken many forms). But it doesn’t seem at all improbable that God would want to create life, both human life and life of other sorts, and if he wanted to created human life in a universe at all like ours, he would have been obliged to fine-tune the constants. On the other hand, on the atheistic hypothesis according to which these constants have their values by chance (that is, those values are not the result of anyone’s choice or intention) it is exceedingly improbable that they would be fine-tuned for life. This seems to offer support for theism: given theism, fine-tuning is not at all improbable; given atheism, it is; therefore theism is to be preferred to atheism."
In addition, why is the world so significantly describable by mathematical structures? Why should that be so, by pure development)? Nature reflects mathematical precision so much so that mathematics is the language of nature. Everything around us can be represented and understood through numbers. Eugene Wigner spoke of the "unreasonable efficacy of mathematics in the natural sciences." Even Pythagoras said the universe is made of numbers. The universe might have been chaotic, but instead it is governed by math, laws, and regularities. This is striking. When we see order, regularity and predictability, we have to consider whether it's wiser to infer that such order and regularity came by way of chances and randomness, or whether it's more reasonable to infer that such order and regularity came from an intelligent, orderly source. What hypothesis is a better explanation?
We know the mathematical value of these constants are not determined by the law of nature. We have 3 choices: physical necessity, chance, or design. We know that it's not due to physical necessity. Physical necessity would require that the constants must have these values, which we know is not true. The laws of nature are consistent with a wide range of values for these constants.
When weighing, then, chance vs. design, an intelligent source is the more reasonable plausibility. Theorists recognize that the odds against fine-tuning are simply insurmountable unless one is ready to embrace a speculative hypothesis of multiverses, but even that doesn't explain that our universe is fine-tuned for life.
Paul Davies, theoretical physicist at Cambridge, said, "It is hard to resist the impression that the present structure of the universe…has been carefully thought out. … The seemingly miraculous concurrence of these numerical values must remain the most compelling evidence for cosmic design."
Plantinga, again: "Perhaps you will claim that no matter how the world had been, it would have been describable by mathematics of some kind or other. Perhaps so; but what is unreasonable, in Wigner's terms, is that the sort of mathematics effective in science is extremely challenging mathematics, though still such that we human beings can grasp and use it (if only after considerable effort). It's not just atomless gunk with nothing happening, or a melange of kaleidoscope variety and succession with no rhyme or reason or patters, or surface variety and chaos and unpredictability. Though all of those might have been possible, instead we have a world that is mathematically describable in terms of fascinating underlying mathematical structures of astounding complexity but also deep simplicity. That mathematics of this sort should be applicable to the world is indeed astounding. It is also properly thought of as unreasonable, in the sense that from a naturalistic perspective it would be wholly unreasonable to expect this sort of mathematics to be useful in describing our world. It makes eminently good sense from the perspective of theism, however. Science is a splendid achievement, and much of its splendor depends upon mathematics being applicable to the world in such a way that it is both accessible to us but also offers a challenge of a higher order. According to theism, God creates human beings in his image, a crucial component of which is the ability to know worthwhile and important things about our world. Science with its mathematical emphasis is a prime example of this image in us: it is both simple and complex, requiring our simple observations as well as our very best efforts, both as communities and individuals, and it delivers magnificent results. All of this seems wholly appropriate from a theistic point of view; as Paul Dirac, who came up with an influential formulation of quantum theory, put it, 'God is a mathematicians of a very high order and he used advanced mathematics in constructing the universe.' So here we have another manifestation of deep concord between science and theistic religion: the way in which mathematics is applicable to the universe."
This is but one argument of several.