Cultic practices of homage paid to Satan, frequently developed from the doctrine that there are two supreme beings, the one all good, the other all evil. Devil- worshipers have argued that since the God of all the good things receives his homage from many, it is only fitting that the god of wickedness should also have cult and worship paid to him.
The chief liturgical service of the Satanists, or Luciferians, as they are called, was the celebration of the Sabbath. They also possessed a service called the Black Mass, over which they believed Satan himself personally presided. In devious ways they obtained Hosts that were truly consecrated, or, whenever possible, they invited apostate priests for the purpose of consecrating the sacred species so that they could be desecrated and profaned.
Devil worship maintained this manner of cult whenever it was practiced by those acquainted with the Judeo-Christian history and the story of the fall of Lucifer.
There are others, like the Kurd Yezidis who still exist today in Upper Mesopotamia, worshiping Satan under the name of Iblis. They do not believe in dualism, but profess the belief that Satan rebelled against God, and that at a later time he was forgiven and given the government of this world and the administration of the transmigration of souls.
Devil worship is obviously a grievous offense against the virtues of charity and religion for all Christians and in most major religions.
Bibliography: e. a. grillot de givry, Picture Museum of Sorcery, Magic and Alchemy (New Hyde Park, NY 1963). l. cristiani, Evidence of Satan in the Modern World, tr. c. rowland (New York 1962). n. corte, Who Is the Devil?, tr. d. k. pryce (New York 1958). h. t. f. rhodes, The Satanic Mass (New York 1955).
[m. d. griffin]
"Devil Worship." New Catholic Encyclopedia. . Encyclopedia.com. (August 16, 2018). http://www.encyclopedia.com/religion/encyclopedias-almanacs-transcripts-and-maps/devil-worship
"Devil Worship." New Catholic Encyclopedia. . Retrieved August 16, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/encyclopedias-almanacs-transcripts-and-maps/devil-worship