Religion, you all say, is bad for the planet - can someone explain to me why it is worse than militant atheism? Let's not argue Hitler all over again. Let's stick to Stalin and Mao. Let's just start with a glance at their combined death tolls - somewhere near 100 million or more. Now tell me again why the RC church is to blame for desertification in China and pollution in Russia
Yes - let's avoid talking about Hitler. Embarrassing to admit that he was born a Catholic, remained a Catholic all his life, was never excommunicated and publicly proclaimed that Jesus was his saviour. Ooops 
But you know what - I would never advance that argument anyway. Because it's stupid. Nothing Hitler did, in terms of atrocities, was because of his religion - or lack of it. He was influenced by an ideology.
And that's the same as Stalin and Mao. Yes, they did terrible things - but it was not in "the name of atheism". The fact that they were atheists had nothing whatsoever to do with it.
I am an atheist. If I went shoplifting tomorrow, who in their right mind would say I was doing it "in the name of atheism"? Nobody does anything because of something they DON'T believe in - that makes no logical sense. They take actions based on what they DO believe in - and in this case it was an ideology. An ideology, by the way, that had far more in common with organised religion than the free-thinking atheism we have today.
They demanded worship, of themselves and the state, and only got rid of religion because that diluted the worship they felt they were due. At no point did they say, "Right...I don't believe in a god, so I'm going to kill people because, er, I don't believe in a god".
Really, this trotting out of Stalin and Mao by Christians displays not only ignorance of the history but also of what atheism actually means.