The referential theory of meaning teaches how words in a natural language possess meaning. Spoken languages consists of sounds. Sounds become words by referring to sensory experience, which produces meanings.
There is no sense reference in the word God. Therefore, it is considered nonsense and conceptually empty. Another example is beauty; beauty is a subjective term that only refers to reporting a feeling or opinion. Sounds that have no sense reference such as "God," "good/bad," or "beauty/ugly" are nonsense. Therefore, the consequence is that our knowledge is limited to hard science such as physics, chemistry, and biology. Fields of study such as theology, ethics, and aesthetics do not exist anymore. Only the critical sciences do.