Dude, check it. Shane made it clear what he is referring to as to the way in which the term "nature" is said:
>>> The premise of the scientific naturalist (sometimes called
>>> "materialist") world view is that "there is *only* Nature."
>>> Shane Mage.
Seems pretty clear to me. You must remember that scientific naturalists are fairly simple (note: I didn't say simple minded) creatures. That's demarcation enough.
--ravi