@David T - very interesting post. I was reminded of Archie J. Bahm's translation of the opening sentence of the Tao Te Ching:
"Nature can never be completely described, for such a description of Nature would have to duplicate Nature."
That means that neither science nor religion (nor any other way of looking at the world) can possibly have a
complete picture. And we have to remember too, as Alfred Korzybski put it: "The
map is not the territory". Unfortunately, as Gregory Bateson pointed out all we have is "maps of maps".
Korzybski decided that the biggest problem was the inappropriate use of the verb "to be". And there is nowhere that this is more starkly apparent than in the religion vs science "wars".
For example, the idea that the Bible describes the creation of the universe as a process taking place over a period of a few days is interpreted to imply that the world
was created in seven days - and I don't just mean by biblical literalists but also by their opponents. Similarly, applying general relativity to the origin of the universe suggests that an apparent singularity emerges as the starting point, and this is taken by many to mean that the universe actually once
was a singularity. Quite apart from the philosophical and scientific absurdity of such notions, it seems obvious (to me) that both of these seemingly untenable positions really arise from our interpreting our mental "maps" as "the territory", the "name" we gave something as the "thing named" - or to put it in the context of your question: the illusion that (our) nature has given us as the reality itself. Then we proceed to argue as if the model (scientific or religious) were the thing itself. Of course they are not - our models of reality - scientific, religious, philosophical...are the illusions that nature has provided for us - the patterns that appear from one angle like this and from another like that. Its like looking at the same mountain from different sides or seeing pictures in the clouds. It is Rorschachian - but it seems like its either really important or really fun - depending on one's preference - to argue about them anyway - and then to declare our favourite pattern of incomplete information to be "the truth"! And that's probably the biggest illusion (or delusion) of all.