There might've been some miscommunication here. It sounded like you were saying words are signifiers of physical objects only, which made no sense to me because there are many, many, many words that do not point at or reference the physical. Rejecting that many words are not about physical things sounds like denying anything else even exists - the extreme position of substance monism whereby there is but one and only one kind of stuff in the universe (in this case, matter). Were you not intending to imply that?
Well, if we're referring to thoughts and ideas, then I acknowledge their existence in the sense that I understand it to be a part of the human experience.
But even if we're talking about theoretical, abstract concepts or any product of the human imagination and creativity, doesn't it still emanate from human brains, which are biological, physical organs?
Our thoughts are not necessarily limited to the physical, and as you alluded to earlier, humans have created wonderful works of art and music - and many other ideas and concepts which aren't necessarily "physical," but also not necessarily coming from any "divine" sources either. It comes from us, from humans who are still contained within physical bodies in a physical reality.
I'm not denying anything else exists, so I was not in any way intending to imply anything along those lines. If anything, I was acknowledging our own limitations within that physical reality and postulating that there's no real reliable way of knowing what is "divine" or "unseen." We can certainly imagine it, as we have vivid imaginations, but that's as far as it goes.
Some might argue that our own sentience and consciousness are, in and of themselves, a "divine spark," so maybe there's something to that. But even assuming that's true, that brings us back to the original question. But beyond that, I don't think there's any real assumptions one can make, even including the idea that we have some sort of obligation to acknowledge the unseen or worship or obey any possible commandments they might have given us.
If they're unseen, it can only be because they don't exist, or they don't want to be seen, which would imply a desire to not interfere or intercede in the daily affairs of humans or the general course of nature as understood within our physical reality. So, even if there might be something beyond physical reality, this is what we've got for now. This is what has been presented to us as our existence.
So, I guess my position would be this: If "they" wish to remain unseen, then let them remain unseen. We humans can go about our lives as if they don't exist.