Yes, I can back my statement up.
http://en.wikipedia.org/wiki/State_atheism#The_Soviet_Union
"State atheism in the Soviet Union was known as "gosateizm,[1] and was based on the ideology of Marxism-Leninism. As the founder of the Soviet state V. I. Lenin put it:
Religion is the opium of the people: this saying of Marx is the cornerstone of the entire ideology of Marxism about religion. All modern religions and churches, all and of every kind of religious organizations are always considered by Marxism as the organs of bourgeois reaction, used for the protection of the exploitation and the stupefaction of the working class.[14]
Marxism-Leninism has consistently advocated the control, suppression, and, ultimately, the elimination of religious beliefs. Within about a year of the revolution the state expropriated all church property, including the churches themselves, and in the period from 1922 to 1926, 28 Russian Orthodox bishops and more than 1,200 priests were killed (a much greater number was subjected to persecution). [15]
In the 1920s and 1930s, such organizations as the League of the Militant Godless ridiculed all religions and harassed believers. Atheism was propagated through schools, communist organizations (such as the Young Pioneer Organization), and the media. Though Lenin originally introduced the Gregorian calendar to the Soviets subsequent efforts to re-organise the week for the purposes of improving worker productivity with the introduction of the Soviet revolutionary calendar had a side-effect that a "holiday will seldom fall on Sunday" [16]"
Also this is interesting: http://en.wikipedia.org/wiki/League_of_the_Militant_Godless
I find it hard to believe that the League of the Militant Godless was not a state-sponsored organization in the Soviet Union. Not all atheists are secular humanists interested in the betterment of mankind.
