Atheist groups can be as sexist as anyone else. But Ms. Magazine wants you to know that there are many prominent women atheists. More importantly, going back to Madalyn Murray O'Hair, women have been leaders of many atheist groups.
Murray O'Hair filed a lawsuit on behalf of her son, William J. Murray III, arguing that his Baltimore public school violated the First Amendment by conducting Bible reading and prayers every school morning. Murray's case was later consolidated with the famous Schempp case, where the Supreme Court ruled in 1963 that the Establishment Clause does not allow the public schools to sponsor prayer and Bible reading.