Satanism
Satanism to me really seems like a lay-persons guide to being a "Good-Atheist". If you don't believe in God and want no part in any sort of organized religion, the basic premise of Satanism is "Do what you want, and don't be a dick".
Even with their overall atmosphere which is often hued with lots of blacks and reds, they only engage in things they want to engage in, and their list of 9 sins to be avoided are rules that most people, whether spiritual or otherwise, would generally agree that we should avoid such things. For your benefit, and an excerpt from the video, the 9 Sins are: The Cardinal Sin topping the list is Stupidity. Ignorance is one thing, but stupidity is what allows people to be controlled through herd mentality, and you cannot afford to be stupid in your life. Stupidity is closely followed by pretentiousness. They believe it’s what keeps money circulating these days, everyone is made to feel like a big shot, whether they actually are or not. From there you have Solipsism, which is acting as if you are the only person in existence without any regard for anyone else. Instead, they adopted a mentality of “Do unto others as they do unto you”, which goes for both virtue and torment, and if someone slaps you, you should slap them back. The next sin is Self Deceit, we shouldn’t lie to ourselves about what is true. Herd Conformity, the only time you should conform to another's wishes is if it genuinely benefits you. Lack of perspective - never lose sight of who and what you are, Keep the wider historical and social picture in mind. Observe the patterns and fit things together as you will. Forgetfulness of past orthodoxies - Don’t forget the past, as modern society often seems to expect us to, which makes for a disposable society. Then comes counterproductive Pride - the first word is very important. Pride can be useful only until you begin to throw the baby out of the bathwater, and your ego goes to your head. And finally, Lack of Aesthetics. Aesthetics are important and are also highly personalized. An eye for beauty and balance is essential in Satanism, and while it’s highly personal, there are also universally pleasing and harmonious configurations that should not be denied. This script was based off of the Church of Satan's website, JoyofSatan.com, Wikipedia, and Satanis: The Devils Mass Documentary.