On 12 April 1961, Gagarin became the first human to travel into space in Vostok 3KA-2 (Vostok 1). His call sign in this flight was Kedr (Cedar). During his flight, Gagarin famously whistled the tune "The Motherland Hears, The Motherland Knows".The first two lines of the song are: "The Motherland hears, the Motherland knows/Where her son flies in the sky". This patriotic song was written by Dmitri Shostakovich in 1951 (opus 86), with words by Yevgeniy Dolmatovsky.
There are speculations in the media that from orbit Gagarin made the comment, "I don't see any God up here." There are, however, no such words in the full verbatim record of Gagarin's conversations with the Earth during the spaceflight. In a 2006 interview a close friend of Gagarin, Colonel Valentin Petrov, stated that Gagarin never said such words, and that the phrase originated from Nikita Khrushchev's speech at the plenum of the Central Committee of the CPSU, where the antireligious propaganda was discussed. In a certain context Khrushchev said, "Gagarin flew into space, but didn't see any God there". Colonel Petrov also said that Gagarin had been baptised into the Orthodox Church as a child.
While in orbit Gagarin was promoted "in the field" from the rank of Senior Lieutenant to Major — and this was the rank at which TASS announced him in its triumphant statement during the flight. Wikipedia.