I'm communist, but you'll need to kill me before I will say that I'm atheist.
Then I don't need to kill you to know it, because you're an atheist. Communist doctrine is clearly atheist.
Religious suffering is, at one and the same time, the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.
Religion is one of the forms of spiritual oppression which everywhere weighs down heavily upon the masses of the people, over burdened by their perpetual work for others, by want and isolation.