This topic I think belongs here, although it is more meta-religion than religion per se. What I want to talk about is supernaturalism as a metaphysical idea, and the intellectual relationship among supernaturalism, classical materialism, and modern physics. I have two contentions here:
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Supernaturalism is logically dependent on classical materialism, and starts by accepting the depiction of the natural world used in classical materialism before adding a supernatural layer to it; and
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Classical materialism is dependent on Newtonian physics, and incompatible with physics as it exists today. By extension, so is supernaturalism.
What do I mean by “supernaturalism”? I mean a belief that there exist phenomena in the world that transcend the laws of nature. This may refer to God, to gods and goddesses, to human psychic powers, or to phenomena such as ghosts and poltergeists – BUT a belief in God, in gods and goddesses, in human psychic powers, or in ghosts and poltergeists does NOT imply supernaturalism. One may believe in all these things, but unless one also believes that they transcend the laws of nature, one is not a supernaturalist.
Supernaturalism is comparatively modern. The ancient world did not distinguish between the natural and the supernatural; the gods (later, God) were considered part of (or the author of) the natural world, and what was understood as “the laws of nature” at that time included their actions. Thus, the Catholic Church could include Aristotelian natural philosophy in its doctrine, and give it a theistic interpretation that Aristotle did not but that was fully compatible with his thinking.
Supernaturalism implies an understanding of what “the laws of nature” are that precludes the existence of things the supernaturalist believes exist. Only when one believes, first, that the “laws of nature” are known, and, second, that they leave no room for God, gods, psychic powers, etc., does anyone wish to introduce a concept of something beyond those laws. And that was not a position anyone could hold until the scientific revolution, nor could it be held with any confidence until the publication of Newton’s Principia Mathematica.
Which brings me to classical materialism. What do I mean by that? I mean a belief that, first, the material world is all that exists, and second, the material world has certain characteristics compatible with Newton’s theories, if not logically arising from them.
According to classical materialist belief, the material world is a deterministic one, completely described by the laws of motion at the particle level. A famous statement of this idea is that, given knowledge of the position and momentum of every particle in the present, it would be possible to predict the entire course of the future with perfect accuracy and precision.
All phenomena, to a classical materialist, can be described and explained in terms of matter, motion, and thermodynamics. In such a world, there is no room for God, the gods, angels or devils, human psychic powers, ghosts, or poltergeists. There is also no room for free will, or for emotion except as a subjective add-on without impact on events. Such is classical materialism.
Supernaturalism is an accommodation to classical materialism. Such was the power and influence of Newton’s physics on all educated people that classical materialism became the accepted view of nature among the educated, and so if one desired to preserve God, free will, etc., one had to resort to the claim that this natural world was impacted by powers from outside of it.
Today’s physics is, of course, completely different from Newton’s, but the implications of it for classical materialism have not been generally recognized except by physicists themselves, and not by all of them. The world described by relativity, quantum mechanics, and chaos – the 20th century’s three-part scientific revolution – is an indeterminate one. That famous statement about knowing the position and momentum of every particle and being able to predict the future breaks down, because we now know that it is impossible to know the position and momentum even of one particle, let alone all of them. And this indeterminacy leaves plenty of room for acts of God, or of the gods, etc., without any need to step outside our understanding of nature’s laws or claim that they have been violated. Plus, there are other characteristics about the world we live in that lend themselves to either an organic or a hologrammic metaphor better than to the old clockwork that Newton’s ideas suggested.
It takes time for ideas to percolate through educated circles. But eventually, the new physics is going to generate a new materialism – what might be called modern or nonclassical materialism – in which the first component of classical materialism (that the material universe is the whole of reality) is retained, but the second component (that the material universe is compatible with Newton’s theories, is deterministic, is like a clockwork, etc.) is abandoned. Since religious, spiritual, and psychic ideas are compatible with the new materialism, there will no longer be a need for supernaturalism, and that, too, will go.