Satanism

noun

1. Worship of Satan (usually synonymous with "the Devil").

   "Religious groups that follow Satanism include Luciferians and Laveyans."

2. A profession, philosophy, or ideological construct featuring a positive, admirable, or useful association to the figure, character or entity known as 'Satan'; or, featuring opposition to all morality and the procurement of what is wanted regardless of the consequences concerning others.
3. LaVeyan Satanism.
4. A devilish disposition.