If I wish to support organizations that fight racism I will do this independent of atheism. While many “isms” may be worthy, they should be supported independent of any kind of atheist organizations…. this includes “feminism, racism, environmentalism, vegetarianism” etc, etc, etc…..
Typical atheist political topics might include, separation of church and state, religious tests for political office, teaching religion as science in school. Please notice…. all of these things are related to theism!