Although Stalin's USSR didn't technically believe in a deity, it still has many religious elements:

* Violently throwing out competing religions, like Christianity

* Belief in a single god-king (Stalin)

* Total faith in the power of communism as the most perfect solution to the world's problems

* Harsh punishments handed out to those who question the orthodoxy (gulags)

* Obsessed with submission of the individual before an institution

Blind, violent faith in bad ideas could reasonably be blamed for a vast amount of the world's problems.