Why are there so few atheist women out there?

It is common knowledge that any atheist organization has a very imbalance male to female ratio. Some of the most outspoken males are atheists. In my experience, women are not usually as interested in atheism, in fact, it can be argued that they tend to be more religious. Maybe women do not tend to feel strongly about being atheist, or maybe the religious or spiritual element is important to their personal identity, maybe women feel that atheism is related to immorality and being perceived as sexually promiscuous and not “lady like”.

Could the lack of interest in atheism be also related to the general lack of interest in politics, philosophy or science? Those are topics usually discussed by men, even on the internet, it is common to see men engage in abstract, philosophical or religious arguments, while women tend to engage in every day issues.

Why is that?