Religion is specifically targeted.
"Religion is the opiate 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.
In the Marxist–Leninist interpretation of Marxist theory, developed primarily by Russian revolutionary Vladimir Lenin, religion is seen as negative to human development, and communist states that follow a Marxist–Leninist variant are atheistic and explicitly antireligious"
Where is this quote from?
Also, you are trying to lay the blame for the actions undertaken by followers of a specific ideology - Marxist-Leninist communism - on atheism in general, and it doesn't work. Atheism is a passive non-belief. Trying to say that someone does something in the name of a non-belief makes no sense. People act in the name of things they believe in, not things they don't believe in.
So are you saying the USA is not an atheist government? I agree with this. Some of your friends don't.
Nobody here has tried to claim the USA is an atheistic country. In fact, it is a secular country, leaning towards religiousness, but not enforcing religiousness with laws and customs. Japan is also a secular country, but it leans towards atheism, and doesn't enforce atheism with laws and customs.
Yes I understand that. Who practices anti-theism? Atheists. So it is not correct to say that noone has been killed in the name of atheism.
You don't seem to, since you keep conflating the two concepts.
None of the people in those countries you mentioned were killed in the name of atheism, or even in the name of anti-theism. They were killed in the name of totalitarian communism. Their religiousness was the excuse used to justify the actions taken against them, but it was done to prevent them from interfering with the aims of the totalitarian communist state. Other groups were also targeted because they were in the way of those aims; for example, people who owned property had it taken from them by the state.
Secondly, even if you're right that totalitarian communism got some of its ideas from atheism...so what? Should we blame the Highlander movies because some people might come to believe that they're Immortals and that they need to chop off heads in order to win swordfights? No, and neither should we try to pin the blame for the murderousness of totalitarian communists on atheism in general. Or, are you willing to have religion in general blamed for everything that people did in the name of their specific religious beliefs?