Therefore both worldviews address the questions of origins, meaning, morality and destiny from a nature only basis. Deified or not it there is nothing transcendent to nature. Their shared dependence on nature only creates the confusion here. To me, since FLW overtly deifies nature, he is not an atheist but is clearly a pantheist.
He can be both. Don't get stuck on etymology as if it's the definition, and the label's a sloppy one anyway. And, I wonder, did FLW make a metaphysical statement in that quote in the OP?
Knowing what I know about the naturalistic pantheists (who've claimed FLW as one, I don't know FLW's view more directly), he's not making a metaphysical argument but is just comparing how he feels about Nature to how theists feel about God. So there are no "truth claims" about the universe here. It's a "this is what I value" claim.
For naturalistic pantheists, science gets the last word in objectively describing the universe as the only able candidate for doing that. It's material, it's physical. That the pantheist values it as worthy of reverence similar to how theists feel for their god does
nothing at all to change that.
The reason to be a pantheist instead of or additionally to atheist is it indicates some noteworthy differences in values. Give a secular atheist and a pantheist a quiz like
this one, they'd have different answers to the values questions but likely the same answers to physics questions. For example, the quiz asks "Are you in awe of the beauty and power of nature?" The anticipated secular-atheist response is: "Yes, but those feelings aren't that significant to me". From my observations of secular atheists, this is the rightly anticipated response. Feelings don't seem to matter the way "facts" do. Call nature so "awesome" it's worthy of adoration, and they're quick to point at things in nature that
humans don't like.
The quiz-maker's idea of how a pantheist would respond is this: "Yes, and those feelings are an important part of my life."
This is the difference that matters. Human concerns are not the central concern in a pantheistic ethos. The reason to care about nature isn't "because we humans need it" but because the sense of identity overlaps it. They have a more ecocentric and/or cosmic view.
About a purported "atheistic worldview"... If you knew "Joe" was an atheist but that's all, you wouldn't know if he were a "consciousness is all" idealist or "everything's matter and energy" physicalist or something else. So what worldview does Joe the atheist have, knowing nothing but that he doesn't believe in God?
"Deify" means "worship, regard, or treat (someone or something) as a god" which doesn't necessitate seeing nature as God. Again, all I see in the FLW quote is a values statement.
"Transcendent to nature"? What's that, needing something "outside" of nature to give people their meaning and some directions on ethics?
What's wrong with the meaning and ethics that naturally emerge from relationships
with tangible entities?
There's a practicable earthbound transcendence available to humans. It's psychological, and an important reason for pantheistic "religious" sentiments. It's a matter of expanding one's identity beyond one's egoic self, with a consequent expansion of the circle of ethical regard beyond "me" and "those things that are the most like 'me'". Also one may shake off the illusion of feeling like a soul stuck inside a skull, looking out on a woeful landscape of "mere matter", wanting a connection to something "more perfect and meaningful" that is "out there somewhere" (but has no apparent existence).