The Church of Satan (CoS) only represents and is LaVeyan Satanism, which is simply another form of atheism.
I can argue that Satan isn't an invention of the abrahamic religions, He was worshipped as the God Creator in ancient times.
Obviously, this is not the case that the abrahamic religions or Bible invented "Satan". Knowledge of the Ancient Languages proves otherwise. Satan existed in the Sumerian East, in the form of SATYAN, which translates to Eternal Truth. The Y in many languages is an E sound, which literally makes "SATEAN" or SATAN. In the White Arabic tribes such as the Yezidis, they still worship the "Peacock named SHAITAN". SA in Egyptian means Life. SAHU is the Egyptian spiritual body of the greatest height. The Hindu Mantra of Serpent Yoga, Kundalini Yoga, is SATANAMA. In Greek, in the "Apocalypse of John", Satan is called SATANAS and not "SATAN". "SATAN" is an english-ized version of this term. in the East, we have the SANATANA DHARMA or the PATH OF TRUTH, which is the Spiritual Path of Ascention. Satanaz and Wotanaz (Odin/Wotan, the Norse God) is found to have many connections.
Theres also SATA the Serpent aka Osiris in ancient Egypt.
Even the arguement of the legitimacy of Hebrew simply is self-defeating. The Hebrews had a language stolen from Egypt. The symbols of "Ancient Hebrew" are almost entirely the same as the Egyptian engravings. They are the same. "SATAN" couldn't have resulted as an original finding either, and the jews found this either in the Middle East, or in Egypt, or in any other place.
And while the name “Shaytan” (Saytan) or “Shaitan” is the Arabic version of Satan’s name, it goes back way farther to Mesopotamia having origins in Chaldea, which is one of the areas that the Yazidis have resided for sometime. They acknowledged Enki as the Sumerian manifestation of Melek Taus, who’s also known as Shaitan (Saitan, Sheitan, Seitan); a divine being that the abrahamic religions later on denoted as the “devil”. It’s also known that at one point, the Yazidis have fled to Russia and settled in the Caucasus region. According to “The New Soviet Psychic Discoveries, A First-Hand Report on the Startling Breakthroughs in Russian Parapsychology” in Russia and the Caucasus, there was a benevolent and protective being called “Shaytan” and he was very much loved and revered. In origin, the Yazidis are an Indo-European ethnic group with very ancient roots that goes way back to India where Melek Taus (Shaitan) is worshiped as Murugan aka Sanat (anagram of Satan) Kumara, who is also thought to be an Eastern equivalent of Lucifer. In Sanskrit, one of the Indo-European languages, the name “Shaytan” or “Saytan” can be seen as an anagram of “Satyan” or “Satyen” meaning “truth” or “lord of the truth.”