Why are all atheists liberals?

[abentwookie]

I'm always amused when people equate liberals with socialists forgetting that real socialists despise both classical liberalism and modern liberalism (because both ideologies promote and allow capitalism to exist).

All atheists definitely are not liberals. I have spent a lot of time arguing with libertarian and conservative atheists during the past few years. They may be a minority in the atheist community but they are a very vocal one

I don't think so, most people associate atheists with left wing liberalism, secularism, tolerance and social liberalism

Well, what people associate something with and the reality of it are often very different. There are plenty of conservatives and libertarians in the atheist community, especially the latter. Sadly, several prominent atheists are libertarians and each has a large following.