sin is religious bullshit anyway
Yep, that's why I used the word.
Suggesting that "people are idiots" actually explains behavior is just like believing in sin - it's just giving up on understanding reality. It makes as much sense as a right wing christian trying explain away their opponents as sinners.
This is factually incorrect though. All human language is natural language. We're an orgasm that has human style language as one of it's traits.
It doesn't really make sense to say that birds don't naturally sing because they teach their children, or that ape gestures and calls are just made up. Incidentally we share a lot of those gestures, showing that human communication systems emerge from the natural processes of evolution.