Gromyko grew up near the district town of Vetka where most of the inhabitants were devoted Old Believers in the Russian Orthodox Church. Gromyko's own village was also predominantly religious, but Gromyko started doubting the supernatural at a very early age. His first dialog on the subject was with his grandmother Marfa, who answered his inquiry about God with "Wait until you get older. Then you will understand all this much better". According to Gromyko, "Other adults said basically the same thing" when talking about religion. Gromyko's neighbour at the time, Mikhail Sjeljutov, was a freethinker and introduced Gromyko to new non-religious ideas and told Gromyko that scientists were beginning to doubt the existence of God. From the age of nine, after the Bolshevik revolution, Gromyko started reading atheist propaganda in flyers and pamphlets. At the age of thirteen Gromyko became a member of the Komsomol and held anti-religious speeches in the village with his friends as well as promoting Communist values.