In the book published in Moscow entitled "Landmarks in the Life of Stalin" (1940), describes Stalin's exchange with a fellow pupil. He read Darwin and became an atheist.
"I began to speak of God. Joseph heard me out, and after a moment's silence, said:
"'You know, they are fooling us, there is no God. '"
"I was astonished at these words. I had never heard anything like it before.
"'How can you say such things, Soso?' I exclaimed.
"'I'll lend you a book to read; it will show you that the world and all living things are quite different from what you imagine, and all this talk about God is sheer nonsense,' Joseph said.
"'What book is that?' I enquired.
"'Darwin. You must read it,' Joseph impressed on me." says G. Glurdjidze. 
- The case against Darwin WorldNetDaily, February 20, 2001