The same way members of the Church of Satan are Satanists. What your probably thinking of is Devil Worship which is different. You can actually go to either of these organizations websites and they should be able to give you a good overview.
Like another comment said, your best source is going to be their own websites. But from an outsider's perspective, their motive seems to be taking the good ideas from the Abrahamic religions (love your neighbor, do unto others as you would have them do unto you, etc) and replacing some of their worse tendencies (close-minded devotion to YOUR interpretation of God and anything less will send you to Hell) with their polar opposites: "Beliefs should conform to one's best scientific understanding of the world" (Tenet V from The Satanic Temple's website)
Why should Christians have a monopoly on fellowship and community? TST can be a secular, humanist way for people to be part of a community without all the baggage of religion and dogmatic thought.
They shouldn't, nor any religion should. Again, I don't have anything against it I just wanted to know how it formed and what are it's beliefs, most religion have a god or some shit I just asked what are theirs.
I don't know them all but I know a few. Yes I do question why there so many and it most likely has to do with money, power or some idealistic bullshit. Again, I have nothing against the organization I was just wondering abouttheirr beliefs
The same way that most Americans say "praise Jesus", I guess. Sure, the latter case might actually believe in Jesus, but they're not worshiping him according to his beliefs.
The satanic Temple is the same in reverse: they don't believe in Satan, but they believe hat following certain tenets make you a better person.
Edit: On a related note, I look forward to the day that voice to text can handle such "complicated" words as "tenets". FFS.