My thesis is that any sort of philosophical naturalism that is taken seriously is incapable of explaining language. And since it cannot explain language, it cannot explain information. And since it cannot explain information it cannot explain, or account for, life.
There is no information without language. This is self-evident and undeniable. If you don't think so, try to deny that proposition without using a language.
There is no language without symbols. This is also self-evident and undeniable. Try to communicate information without the use of symbols.
Symbols are characters, or more generally, "things," that represent other things, both material and abstract. The key word here is represent. In any written language, letters are arranged into words, or terms, to represent things in the universe, whether real or imaginary. Different words have different tasks (noun, verb, etc...) and they are arranged into sentences and phrases using the rules of the language (grammar and syntax) in order to communicate a message (the semantic content) for a purpose (why are you speaking in the first place?). Other languages that rely on signs, clicks, scents, or whatever still have symbols that relate one thing to another. Think of the sign language you may see on the freeway on any given day during rush hour traffic. No words are exchanged, but messages are being communicated.
So how do we account for this "representation" thing? How is it that "cat" can mean a certain kind of mammal? The letters "cat" mean, or represent, or refer to an actual instance of a cat, or cats in general. How does that happen?
If one takes seriously the position of naturalism, or something like naturalism, that nature is all that there is and that this includes only material or physical things, or things that can be described by our best physical theories, then since physical things are all that exist, all things must be explainable by physical theories (or physical laws or physics). A philosopher would say that the natural world is "causally closed." This means that all explanations begin and end in physical laws. There is no place for mind, and certainly no place for Mind, in any explanation of anything. So the naturalist must be able to explain the idea of representation, or symbols, by only using the laws of physics if he wants to explain language and thus information.
I'm not sure that we could even imagine how to do this. In fact, I am sure that we cannot. We can't imagine how physics could explain language because nothing in language has anything to do with sub-atomic particles in energy fields. What equations of quantum physics tell us that "cat" represents a certain kind of mammal? What part of general relativity tells us that "act" ("cat" rearranged) means to do something in one context, something done in another context, and a segment of a play in yet another context? What part of the Standard Model describes this "context"? The laws of physics are themselves "written" in the language of mathematics. But there is no law of physics that says "cat" means a certain kind of mammal. I'm certain. I've checked. Thus, naturalism utterly fails to account for language and therefore information.
If naturalism fails to account for what must be explained if we are going to explain life, i.e. information, then any naturalistic explanation for life, one that eschews Mind, must be false. After all, if Darwinian evolution, or something like it, is true, it could explain language and information within the constraints of naturalism. But it can't explain language and therefore it can't explain information. Therefore, it is not true. This (modus tollens) is a valid form of argument and the premises are true. Therefore, it is sound and the conclusion is necessarily true. Darwinian evolutionary theory, or whatever comes in its naturalistic place, is false. It is false now. It will always be false. In fact, it cannot be anything but false.
Therefore, we are finished. Naturalism as the basis for any explanation of anything fails because it is logically incoherent. It claims that physics can explain everything but physics can't explain language, or anything else that exists in the abstract. Things like economic laws, or the very laws of physics themselves, or the mathematics in which they are written, for that matter. Therefore, the proponent of naturalism is not being intellectually serious (or honest) when he argues against Mind and mind by using language when his own assumptions, strictly adhered to, not only deny the existence of language but have no hope of ever explaining it.