Jn. 4:24 is a statement about God's essence, being, substance, nature. God is spirit, not matter, not rock, not dog, not man, not tree, not candy, not water, etc.
Ontology, metaphysics, being, essence, etc. may not be words in all English Bibles, but the concepts are germane and necessary to this discussion. Anti-intellectualism and simplistic thinking (simple is fine, but not simpleton) often goes with deception and deadly error. Jesus and Paul were not dummies.
If medicine merits a technical vocabulary, how much more does theology, philosophy, etc.