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[[Karl Marx]] said "[Religion] is the opium of the people".  Marx also stated: "[[Communism]] begins from the outset (Owen) with atheism; but atheism is at first far from being communism; indeed, that atheism is still mostly an abstraction.<ref>Mulligan, Martin (1959). [http://www.marxists.org/archive/marx/works/1844/manuscripts/comm.htm "Private property and communism"] translation of Marx, Karl (1932), ''Economic and Philosophic Manuscripts of 1844'' (Moscow:  Progress Publishers).  Retrieved on July 17, 2014.  Caution:  Presumably copyrighted in the United States until 2054 and in the United Kingdom until 2029.  For fair educational use only.</ref>

[[Karl Marx]] said "[Religion] is the opium of the people".  Marx also stated: "[[Communism]] begins from the outset (Owen) with atheism; but atheism is at first far from being communism; indeed, that atheism is still mostly an abstraction.<ref>Mulligan, Martin (1959). [http://www.marxists.org/archive/marx/works/1844/manuscripts/comm.htm "Private property and communism"] translation of Marx, Karl (1932), ''Economic and Philosophic Manuscripts of 1844'' (Moscow:  Progress Publishers).  Retrieved on July 17, 2014.  Caution:  Presumably copyrighted in the United States until 2054 and in the United Kingdom until 2029.  For fair educational use only.</ref>

[[Vladimir Lenin]] similarly wrote regarding atheism and communism: "A Marxist must be a [[materialism|materialist]], i. e., an enemy of religion, but a dialectical materialist, i. e., one who treats the struggle against religion not in an abstract way, not on the basis of remote, purely theoretical, never varying preaching, but in a concrete way, on the basis of the [[class struggle]] which is going on in practice and is educating the masses more and better than anything else could."<ref>Rothstein, Andrew and Issacs, Bernard (1973). [http://www.marxists.org/archive/lenin/works/1909/may/13.htm "The attitude of the worker's party to religion"] translation of Lenin, Vladimir (1909), ''Proletary'', No. 45, May 13 (26), ''Collected Works'', (Moscow: Progress Publishers) vol. 15, pp. 402-13.  Retrieved on July 17, 2014.  Caution:  Presumably copyrighted in the United States until 2068.  For fair educational use only. </ref>

[[Vladimir Lenin]] similarly wrote regarding atheism and communism: "A Marxist must be a [[materialism|materialist]], i.e., an enemy of religion, but a dialectical materialist, i.e., one who treats the struggle against religion not in an abstract way, not on the basis of remote, purely theoretical, never varying preaching, but in a concrete way, on the basis of the [[class struggle]] which is going on in practice and is educating the masses more and better than anything else could."<ref>Rothstein, Andrew and Issacs, Bernard (1973). [http://www.marxists.org/archive/lenin/works/1909/may/13.htm "The attitude of the worker's party to religion"] translation of Lenin, Vladimir (1909), ''Proletary'', No. 45, May 13 (26), ''Collected Works'', (Moscow: Progress Publishers) vol. 15, pp. 402-13.  Retrieved on July 17, 2014.  Caution:  Presumably copyrighted in the United States until 2068.  For fair educational use only. </ref>

=== The Russian revolution caused the most notable spread of atheism ===

=== The Russian revolution caused the most notable spread of atheism ===