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

[Existentialist]

Does any atheist try to inspire people to go out and kill believers? I doubt you can show me where that has occurred. But I would have no trouble showing you where religions have condoned and inspired the killing of others.

Does any atheist try to inspire people to go out and kill believers? Well there are a couple that come close but literally speaking, no, not that I can think of. So? Does this mean atheism doesn't kill people and religion does? That atheism doesn't inspire people to kill people but religion does? I don't think it means any such thing. As an atheist, I think the influence of religion on human behaviour is miniscule. In the kind of conflicts that lead up to killings I look for humanistic causes. The biggest cause and the ultimate responsibility lies in the mind of the killer. Their mindset is the mindset of a killer. they must answer for their acts and take the consequences. If we're looking at the geopolitical influences that lead to many people participating in the conflict at the same time, religion rarely if ever figures as the principal reason. Belief and ideology may superimpose themselves on the conflict, but I doubt you can show me where they have been the cause.

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And we wouldn't get an atheist telling his congregants

Atheists do not have congregants.

con·gre·ga·tion (knggr-gshn)
n.
1. The act of assembling.
2. A body of assembled people or things; a gathering.
3.
a. A group of people gathered for religious worship.
b. The members of a specific religious group who regularly worship at a church or synagogue.

We don't have churches. Or priests. Or holy days. Or bingo. Or child-molesting parties.

Atheists never assemble?

What?

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from an ignorant perspective there are legitimate reasons why Atheism might be thought of as an ideology

Tell you what, how about you try not to explain an ambiguity with another ambiguity?