G'day Austin, looks like you have stumbled upon a Satanist website and probably a LeVayan Satanist website I think from the pic you loaded. Anton LaVey began the movement back in the sixties I think, in protest against the blatant hypocrisy of the churches and their teachings.
While some Satanists are atheists, ie with a lack of belief in gods, atheists aren't necessarily Satanists. Satanists don't believe in the Christian god in particular. Strangely enough they don't claim to believe in the devil either. They believe in the freedom of the human mind, unshackled by the superstitious restraints of monotheistic dogma or something like that...they worship the freedom to enjoy all the things the Bible condemns, but insist they do not condone murder or torture or harming people,(without just cause) or being cruel to animals or children for any reason.
They like to dress up in their weird devil costumes for their "Wednesday night meetings" and perform rituals with pentagrams and stuff because they hope to annoy conservative christians and act out their protest.

Literally, and maybe even literaturely, if you follow the ancient religions back to Mesopotamia, they are quite right in naming Ea as the real, well, original god. From the Mesopotamian myths you can follow a path down through history that leads to Jehovah/Yahweh because the Pentateuch was just a rehash of all the older religions that preceded and even competed with the early forms of Judaism until up to Roman times.
From what I have read they don't really believe any of it. They see themselves as a focal point to oppose organised religion and to combat the limits they place on mankind.

Being an atheist does not make you a Satanist.

Cheers.

PS This is the sort of thing those public minded Satanists get up to in the States.

https://www.npr.org/2018/08/17/639726472/satanic-temple-protests-ten-com...

I hope I got all that right, no doubt a real Satanist in AR will correct me if I am wrong.

I have read some of the material there. This group is different in that they really seem to be selling the black magic stuff. But what they are selling is no different than the sort of christian magic stuff the mainstream religions are pushing.
What specifically worries you about this Joy of Satan group? You need a website to debunk what these guys are claiming? Let me help, its bullshit, all of it.
You have just relieved yourself of the burden of religious church lies, just apply the same sort of logic you used to this satanic website. Apply your newly found critical thinking skills.
Just because they refer to ancient history does not give their claims any authority. And some of it is not exactly correct from my quick read.
I will read more of this site this weekend and give you a better review. In the meantime, relax. If you have just realised gods don't exist, why would you think devils do? Mankind has created imaginary versions of both.

Yes, what Cog just said.

I started to read the first of the three chapters of The Origins of Satanism and its a poorly constructed fabrication of history, very selective in its interpretation and heavily biased against Judaism and Catholicism all wrapped in an outrageous conspiracy theory which has supposedly been going on for thousands of years which keeps 'real spiritual power' in the hands of a few secret, "gasp*shock*horror", which is loopy enough to make my bullshit deflectors spring into action.

Chapter 1 goes on to detail how a lot of symbols and meanings, doctrines etc were always "stolen", on purpose, redacted, heavily edited and mangled from earlier mythologies, including, one suspects from this religion of Satanism. Did you know that Enki is Satan?...who was one of the first Nephilim to arrive on earth...where a lot of different alien races have come and lived amongst mankind.....the pyramids were built by the Gods and inscribed with truth...theres a lot of presumptions about ancient symbolism, snakes and bulls and other references which makes absolutely no mention of matriarchal belief systems which were fundamentally important before the rise of specifically patriarchal systems like well Judaism...I am struck with the claim that the double snake emblem is supposed to represent the DNA double helix way back four thousand years ago when they mapped the human genome, when it was simply a way of reinforcing the powerful symbolism of the serpent with its male/female symbolism (penis/vagina) and immortality (the ability to slough its skin to rejuvenate) like the waxing and waning moon (usually considered female with its close relation to menstrual cycles) and it was associated with the tree of life because thats where you usually found snakes, around trees, which were considered sacred because they connected the earth (morther) with the sky (father).....

No. After just half an hour, I just cant read any more. I dont care to comment any further. Its insane bullshit with nonsensical distortions of history, myth and definitions. I only get one weekend a week and my love of free time is not worth wading through this silly retelling of history and fables.

Austin, there is nothing to any of this. Forget this site, its for idiots with lives and time and intellect to waste. Get back to enjoying your new found freedom of thinking for yourself without guilt or condemnation. Be an atheist.