An adherent of any form of
Satanism, a broad category of religions and worldviews all involving a favorable interpretation of "Satan." The most public form of Satanism is
LaVeyan Satanism, which does not believe in or worship Satan as an actual entity, but instead sees Satan as a symbol of independence, individuality, etc. Since the late 1990's, thanks to the Internet, Satanism had
diversified quite a bit. There are now more and more theistic Satanists, who do revere Satan as a deity - in most cases also associating Satan with independence, individuality, etc. Most do not see Satan as "evil" except in an ironic sense.