>Some people say syntax doesn't matter
Who said that? I've never heard anyone say that in my life. Anyone who says that is clinically retarded.
Syntax is literally the central factor of a programming language.
The speed of a compile, or your program to be interpreted, is 100% dedicated to the compiler and interpreter. Those are not part of the language. They're made for the language, which is defined by it's syntax.
A programming language is strictly the set of rules that someone has defined it by. Technically, every language capable of being turing complete is a programming language, so English could be a programming language.
Whoever told you that should be beheaded.