Traditionally speaking, most religions were especially hostile towards women.
While some atheists consider themselves as spiritual people, most do so because they haven't yet found the appropriate "label" for themselves. Atheism is, simply put and by definition, the belief that there is no God nor divine presence. Some atheists define it as a lack of belief in a God or deity, while others discover that the proper "label" for them would actually be agnostic, rather than atheist.
In the words of Penn Jillette, a US-American comedian, illusionist and writer:
"Believing there is no God gives me more room for belief in family, people, love, truth, beauty, sex, Jell-o, and all the other things I can prove and that make this life the best life I will ever have. "
Here is an article by Ricky Gervais, an English writer, comedian and actor on how he went from "God-bless" to God-less in one afternoon.
To All Religious People & All Atheists: An Invitation for Eternity