I'm not drawing parallels, however, between atheists and environmentalists. First of all, I do not think that atheists, in general, are alienating anyone. A vocal minority of anti-theists spend much of their time alienating all and everyone who comes within their sights, be they people of faith or tolerant, "live and let live atheists". Their purpose is to alienate, period. Their goal is to divide us all into believers and non-believers and ne'er the twain shall meet.
Of course, they don't openly offend people IRL. They have to survive. They only do that here, hopefully. But, I doubt they work with progressive religious groups IRL, on environmental projects which are in all our interests.
I do not think anyone should stop questioning beliefs or stating their own beliefs. I think we can have civilized and respectful dialog, without the insults and accusations of delusion and insanity. I do not support religious privilege or privilege of any sort, unless it is earned.
Respect. 
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