Context: The vocabulary (mainly abstract and literary words), principles of word formations, and, to some extent, inflections and literary style of Russian have been also influenced by Church Slavonic, a developed and partly russified form of the South Slavic Old Church Slavonic language used by the Russian Orthodox Church. However, the East Slavic forms have tended to be used exclusively in the various dialects that are experiencing a rapid decline. In some cases, both the East Slavic and the Church Slavonic forms are in use, with many different meanings. For details, see Russian phonology and History of the Russian language.

Question: What language does the Russian Orthodox Church use?
Answer: South Slavic Old Church Slavonic

Question: What kind of words in Russian have been influenced by Church Slavonic?
Answer: mainly abstract and literary words

Question: What word forms are used together in some cases?
Answer: East Slavic and the Church Slavonic

Question: What church uses mainly the Russian language?
Answer: Unanswerable

Question: What has the Russian Orthodox Church been experiencing in attendance recently?
Answer: Unanswerable

Question: What has the vocabulary of East Slavic been influenced by?
Answer: Unanswerable

Question: How many meanings are there in modern forms of Russian?
Answer: Unanswerable

Question: What has the literary style of East Slavic been influenced by?
Answer: Unanswerable