I never called him a religious extremist, or an atheist extremist. I said he killed people in order to promote atheism, which he did.

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Atheists have never killed people for atheism, so they’re not the same as religious extremists at all. That’s very offensive.
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 is what prompted my mention of Stalin. He was an atheist who killed people for atheism. 

However, I could have as easily said that atheist extremeists are as bad as political extremists, and my point would remain the same.