Poli, would you agree that there is a real, wordless reality, which our verbal models (and mental ones, too; never forget that our interpretations of sensory data are also models) attempt to represent?
Do you agree that we have a mutually accessible physical reality, which our thoughts and words can model with considerable but not perfect accuracy, and about which we can come to common mental and verbal understandings?
If you do so agree- if you accept that we actually live in the same physical world, and we don't just think we do- then as long as we can adequately (if not perfectly) define our terms in ways that are well anchored to that physical world, our words are useful, and we can talk about even such high abstractions as gods. Also about such things as liberty, or electrons, or magnetic fields. We can carefully build our ladders of abstraction, models of models, and have some confidence that they have meaning- that they are true.
Or, that they are NOT true. Which, I'd say, is the case with god(s); because, first off, those who try to define god(s) cannot anchor their model(s) to the wordless physical world. Whereas, we can demonstrate what we mean by magnetic fields, or plenty of other highly complex and abstract terms.