Is it true that atheism has killed more people then organized religion?...

[Existentialist]

No I mean you'd have to disagree with what the word means.

If, for example, I say that the word "cheese" means: "A slide in a children's playground", I am redefining the word in the same sense that you are redefining atheism.

Cheese is a bad example. Socialism would be a better analogy.

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Atheism per se is not an ideology

Well in my book it is. But then, I think the definitions of words can be arrived at subjectively and the purpose of discussion is to enable people to compare their subjective definitions. I'm well aware that others think arguments are settled objectively by dictionaries or hard logic, and that a dissenter is just wrong.