OK, I need to be a major jerk, because the same error reappears throughout this thread. Language is not culture. The two influence one another, no doubt, but they are not interchangeable concepts, and language is most certainly not a subset of culture. Indeed, trying to measure diversity by assuming that they are the same or a subset of one another leads to contradictory conclusions. The period of greatest linguistic diversity, the Paleolithic, probably had the least cultural diversity, owing to the simplicity of culture itself: basic tools, basic ornaments, basic vestments, etc. Conversely, English has a huge influence on the contemporary world, introducing new loan words and becoming secondary and tertiary tongues (though it should be conceptualized as Englishes), its relative ubiquity doesn't undermine cultural complexity in and of itself. English is not among the strongest homogenizing forces in the world.
I'm not trying to imply that. But language is a basic block of culture; what we call a thing becomes part of us, imbuing it with a shared form. Consider the efforts of linguistic purism around the world, most notably the French, & even more so in Icelandic. So in essence, changing the usage of a word, the design of a word, or the pronunciation of a word can effect ripples through the culture. Look even at some of the epithets used. Just last week, I glared at someone who said they "jewed the guy down on the price" & I had to educate her as to the etymology of the term; she never even thought about where it might've come from. Same thing for saying "gypped"--it means being cheated, & comes from how many subcultures hold that the Romani (Gypsies) are all thieves & cheats.