Atheist Alliance International - Welcome! International Society for Science & Religion. The Freethinker | The voice of atheism since 1881. AtheismUK. Atheist Ireland | Building a rational, ethical and secular society free from superstition and supernaturalism. The BHA | British Humanist Association | For the one life we have. National Secular Society - Challenging Religious Privilege. The Rationalist Association | Rationalist Association.