Big "S" Socialism happens when small "s" socialists (community minded people) place so much trust in their socialist leaders that they don't even recognize when those socialist leaders become Socialist leaders.
I personally fell into this trap in a significant way. Now I am hoping that it isn't to late. And spending some effort to try to foster some recovery...as evidenced by my post here.
Big "S" Socialism isn't really socialism. Neither is big "L" Libertarianism really libertarianism. Both of them are something like dictatorships, fascism, capitalism, or some combination of these, and maybe something else altogether.
The fact that we have and recognize our personal identities, and the fact that we don't know enough to truly prove or disprove God, shows that we are religiously minded. Thus, atheism is simply another religion. It falls into the class of religions that suggest man is god/God, and should really be spelled "Atheism."

I'll not argue against your point about Atheism either. Nor will I change my ways of course other than to become more accepting than I have been at some points. The fact of the matter is that many of the mildly religious people I know are simply better persons in many ways than are some of non-religious folks. And 'Green' is a religion in and of itself which brings out some really awful thought pasterns and behaviors against other humans as often as not.