They believe in individualism, the power of thought, free will, and chaos, borrowing symbols from various mythologies to describe those ideas. The idea of Satan being far, far older than Christianity, Judaism or Islam. Coincidentally, none of those ideas are supernatural.
Stop talking about your own life as if it is representative of the millions of atheists out there. It isn't. You even just disproved your own thesis, which is that atheists don't organize. Hahaha.