The theory does portray nature as self-sufficient,by excluding God's power in nature and attributing natural mechanisms with powers they do not have.
No, the theory doesn't.
Atheists and materialists interpreting the theory in line with their (un)belief do. And this interpretation depends on asserting that "natural" means "without God/without divine action".
As believers, we have just as much right to interpret the theory of evolution in line with our theist beliefs as materialists do to interpret the theory of evolution in line with their philosophic beliefs.
Science has no capacity to judge which philosophical treatment of the theory of evolution is nearer the truth.
The theory cannot be summed up as merely descent with modification. It is primarily a narrative of the history of all organisms,and it includes such claims as the common descent of all species,and natural selection working upon mutations to produce all variety. Descent with modification is something that has always been observed. That is not what the argument over evolution is about.
Actually, the theory can be summed up as descent with modification--together with a description of how those modifications happen. What you are doing is amalgamating the concept of how evolution happens--which is, strictly speaking, the theory of evolution by natural selection--and the historical sequence of life forms produced by this process. The latter is what the study of phylogeny is all about.
The philosopher of science, Michael Ruse, IIRC, has proposed that for clarity, we distinguish three meanings of evolution:
1. the fact of evolution (it is a fact that species change over time)
2. the process of evolution (mutations, natural selection, speciation, etc.--IOW the mechanisms of how species change over time). This is, in a strict sense what the theory of evolution sets out.
3. the history of evolution (in what order did evolutionary changes occur? how are various species and groups of species related to each other through lines of descent? IOW, can we work out a phylogeny--a genealogy of species--in much the same way we do a family tree for individuals?)
Broadly speaking "evolution" or "theory of evolution" encompasses all three, but for clarity, it is wise to note when one is dealing with 2 and when one is dealing with 3 as they are based on different lines of evidence. IOW, a weakness in an argument about how an evolutionary mechanism works does not undermine a proposed phylogenetic relationship, nor does a weakness in a proposed phylogenetic relationship undermine the theory of evolution from the perspective of whether evolution happens or how it works.
I didn't say that. The naturalistic explanations of science exclude God,which is not the same as any and all explanations that use natural causes.
How might an explanation that uses natural causes not be naturalistic?
Or, to be concrete: I can explain the weather by means of natural causes. Does that mean I view the weather naturalistically?
When words come from the same family, and also change meaning over time, it often happens that people are using the same words with different implications. I know most people hate semantic arguments, but sometimes they are crucial to understanding what is really at issue.
Here we need to sort out the meanings of these related terms:
nature
natural
naturalist
naturalism
naturalistic
From a Christian perspective, we could say that by "nature" we mean "that which God created; all that is not God is created by God and constitutes 'nature'." (note that this would include angelic beings as part of "nature".) More narrowly, we could define "nature" as "the material order which God created". This would exclude angelic beings and limit the term "nature" to what exists physically. (Interestingly, "physical" and "physics" are derived from the Greek "physis" meaning "nature".)
I think most of us would agree that by "natural" we mean "what pertains to nature" and by the narrower meaning above, that would mean "what pertains to the physical, material creation."
Another meaning of "natural" in this respect is "not artificial", that is "not produced by human artifice". We recognize that a television set is "not natural". It takes humans to produce them. Archeologists and paleontologists need to be able to distinguish between what humans must have made and what could occur without human action.
("art" originally included everything we include under technology as well as imaginative art. The Greek term "techne" referred to anything made with skill from arrowheads to poetry)
It is also interesting to note that the natural/artificial distinction applies specifically to human activity. A man building a house is engaging in artifice. A bird building a nest, or a beaver building a dam are acting naturally.
From this standpoint, that "natural" excludes specifically human artifice, it follows that the world of nature is pre-eminently the field of divine activity. And that is the way nature is presented in the bible. Humans feed domesticated cattle and chickens, but God feeds the lions and the ravens. And God does so naturally. (i.e. without special supernatural intervention).
We might note as well that Darwin's choice of "natural selection" to describe how certain organisms get preferential treatment in the struggle to survive is also grounded in this natural/artificial distinction (for he contrasts it with selective breeding by humans) and not, as is often assumed, in a distinction of natural vs. supernatural.
naturalist: this is a word that has completely changed its meaning since the 1800s.
Since "nature" is the physical world and "natural" is what pertains to nature, the study of nature was called from medieval times up to the late 19th century "natural philosophy". Only recently was that phrase changed to "science". And any person systematically studying nature was called a "naturalist". That term has been transmuted to "scientist". When "naturalist" had the simple meaning of "one who studies nature" there was, of course, absolutely no suggestion that such a person was necessarily a believer or not.
However, also in the 19th century, a philosophical view arose that "nature--the physical world--constitutes the sum total of all existence, all reality".
This view became known as "naturalism" and of course, a person holding this view is what most of us mean now by "naturalist".
Now this philosophical view transcends the issue of evolution, and even science as a whole. Science (natural philosophy) is a study of what is natural, of nature. It does not demand any acknowledgement that its field of study be the only existing reality. Evolution, as part of science, is part of the study of nature; it is not a commitment to a view that nothing but the physical exists or that all things (ideas, thought, spirit) are grounded in physical causes, or that physical processes are never subject to non-physical causation.
Which takes us to "naturalistic". This term tends to be used in two ways. One way is "explanations that refer to natural/physical causes without commentary on whether other causes exist". Another way is "explanations based on a philosophy of naturalism, i.e. the rejection that there exist any causes other than physical causes".
And these are seldom distinguished.
Personally, I think the first meaning is part of a deplorable tendency to use longer than necessary terminology (like "utilize" for "use"). The "-istic" suffix is unnecessary in this context, and it would be clearer to say that "explanations which refer to natural/physical causes" are "natural" rather than "naturalistic".
That would free up "naturalistic" to refer exclusively to "explanations based on a philosophy of naturalism".
However, since I can't dictate to all English-speakers how to use words precisely, we will have to put up with the ambiguity of "naturalistic".
The important thing to note is that it IS an ambiguous term.
For one person, such as Antony, it may enshrine the whole concept of philosophical naturalism--the limitation of all existence to what is physical. That assumption means that a causal explanation couched in terms of physical cause and effect amounts to a denial of the divine.
For another person, such as shernren, it may simply mean that the list of causes enumerated are those of nature, without prejudice as to the relationship of God and nature. That sense is completely compatible with the biblical view that nature is the sphere of God's activity as distinct from human activity.
I expect that Antony and shernren are in closer agreement than is obvious, but that agreement is masked as they are using the word "naturalistic" to encompass a different range of meanings.
Only if you want them to, my friend.
Exactly.