No, my distinction is between purely conceptual / imaginary beings, ones found only in individual brains, as distinct from beings with objective existence, those found in the world external to the self (aka nature, the realm of the physical sciences, &c).
But I am afraid that what may look imaginary and non-useful to someone might not be so to some others. Please note that this has nothing to do with one's intelligence level.
Being a realistic scientist, I accept an idea in my set of knowledge if it is logical and useful to me. This idea doesn't have to refer to an existing thing. For example, when I started learning geometry, I accepted the notion of the
geometrical dot (point) which cannot exist by definition (dimensionless). If I refused this imaginary idea, I wouldn't be able learning any scientific field which may be based on it.
I also accepted the notion of
infinity though I know in advance that I will never reach it (like two parallel lines intersect at infinity). But this imaginary notion of something that cannot exist in our limited world helps, for example, in drawing perspective images. Also, it helps me solving some algebraic problems.
Didn't you hear of the
imaginary number (labeled i or j) which is the square root of -1? Again, I accepted it because it helps me solve certain problems and it ends up giving me real and useful results (though it is an imaginary non-real one).
In brief, if the notion of God (the Will/Energy behind the creation of our well defined complex universe, starting from our own body in which zillion of pre-programmed living cells know very well what to do) cannot be useful to someone, it is better for him to just forget it. In fact, I know many people who have no interest in many notions of imaginary things (in Math, Physics and the like) and, at the same time, they are all very satisfied of themselves.
I hope you get now why I started with:
I am afraid that what may look imaginary and non-useful to someone might not be so to some others.
In what manner does this "Will/ Energy" exist, then? If it's not physical, something found in nature, then it can ONLY be conceptual / imaginary, no?
At least it exists in me. Please note that it doesn't have to exist in every living being, humans included.
When I was a baby, I was totally ignorant (had no perception at all) about my own existence and the 'real' world into which I was brought temporarily. Then, things in me have evolved till I asked myself: "For which purpose I was forced to exist temporarily in this universe?". I deliberately used the verb ‘forced’ to emphasize that the beginning of my existence has nothing to do with my actual will by which I can end it anytime or not.
Naturally, to answer this question (crucial to me, so please note that not everyone feels the real need to discover the answer of such a question) I had to search my unknown origin (as in fiction movies); that is searching the Will/Energy behind my own existence. Since many decades, I discovered the answer; logical and useful, to me in the least (besides all other important answers I was looking for). This is why I fully understand, for example, why you have no interest at all in a notion which refers to whatever could be behind your existence.