At first I was like "WTF! does not compute", so I looked it up.  And sho'nuff there it is... (from Wikipedia)

LaVeyan Satanism

Main article: LaVeyan Satanism

Anton LaVey founded the Church of Satan in 1966 and his writings were the foundation of LaVeyan Satanism.

LaVeyan Satanism is a religion founded in 1966 by Anton Szandor LaVey. Its teachings are based on individualism, self-indulgence, and "eye for an eye" morality. Unlike Theistic Satanists, LaVeyan Satanists are atheists and agnostics who regard Satan as a symbol of man's inherent nature.[2] According to religioustolerance.org, LaVeyan Satanism is a "small religious group that is unrelated to any other faith, and whose members feel free to satisfy their urges responsibly, exhibit kindness to their friends, and attack their enemies".[3] Its beliefs were first detailed in The Satanic Bible and it is overseen by the Church of Satan.

Now do I have to clarify that I'm just plain atheist when asked so there's no confusion?

We are a way for the cosmos to know itself.