[seanmcdirmid]

newbie take: there is one Chinese language

intermediate take: there are many Chinese languages

expert take: there is one Chinese language

There are also plenty of languages in China that are not Chinese or a dialect of Chinese. Tibetan and Mongolian (and their many dialects) are obviously not Chinese. Chinese written language is used as a phonetic script for some minority languages (although many are based on uighur script is used a lot also, Uighur itself uses arabic).