Rudolf Steiner's The Philosophy Of Freedom, published in 1894, is a humanist philosophy of knowledge and ethics based on the empirical observation of the mind. So it has value to anyone interested in science more so than blind belief, whether conservative or progressive, spiritualist or atheist, idealist or realist. This includes the secular, agnostic and atheist community, which has a strong interest in science. We have been using twitter, "Ethical Humanism" to reach this community.
A new atheist online magazine called Atheism United posted a link to our recent blog post "First Impression Judgments Are An Error In Thinking". It is exciting to have attracted interest from the atheist community.
A recent poll shows a 13% decline in the U.S. in those who say they are "Religious" while Atheism is rising around the world. This decline would be expected in our age of science as "We no longer want to believe; we want to know." Philosophy Of Freedom 0.3
Well known atheists/agnostics include Stephen Hawking, Albert Einstein, Bill Gates, Mark Zuckerberg, Steve Wozaniak, John Lennon and Mark Twain.