Book excerpt: In her book, Gulnaz Sibgatullina examines the intricate relationship of religion, identity and language-related beliefs against the background of socio-political changes in post-Soviet Russia. Focusing on the Russian and Tatar languages, she explores how they simultaneously serve the needs of both Muslims and Christians living in the country today. Mapping linguistic strategies of missionaries, converts and religious authorities, Sibgatullina demonstrates how sacred vocabulary in each of the languages is being contested by a variety of social actors, often with competing agendas. These linguistic collisions not only affect meanings of the religious lexicon in Tatar and Russian but also drive a gradual convergence of Russia's Islam and Christianity.