Humans cannot ignore syntax or semantics, if that's what you're saying. Every human language has both, and no one can speak a language without knowing (usually implicitly) both.
As for phonology, languages have that (even signed languages), but I don't see it as being more fundamental than syntax or semantics. Indeed, while some writing systems have something analogous to phonology (context-sensitive letter shapes, as in Arabic script, but also in Greek), some don't. And it's possible to learn written language without any spoken language--deaf people do that.
As for phonology, languages have that (even signed languages), but I don't see it as being more fundamental than syntax or semantics. Indeed, while some writing systems have something analogous to phonology (context-sensitive letter shapes, as in Arabic script, but also in Greek), some don't. And it's possible to learn written language without any spoken language--deaf people do that.