Satanists need to know at least a little history about Satanism to consider themselves a Satanist--or at least be a serious Satanist.
If you don't agree with every single point in the Satanic Bible, you're not a Satanist
Satanists have altars. If you don't have an altar, and if it's not set up the way it should be (it's written in the Satanic Bible!) then you're doing the dogma thing wrong.
A Satanist takes special care to gratify themselves specifically in the 7 Sins of the Holy Bible since Christianity is antithetical to Satanism and we are adversarial to such religious perspectives.
The very point of Satanism is being adversarial to things. Going along with the crowd is distinctly unbecoming of a Satanist and should be avoided at all costs to avoid herd conformity.
We're all in the Anti-Christian Club. Literally, Christianity is the ENEMY of Satanism (and LaVey said Buddhism was as well!) so THEREFORE it's totally okay to hate on Christians, Catholics, Jews, Moslims, Buddhists, and you know, religions like that, because they're our enemies.
You don't have to be a registered member of the Church of Satan or The Satanic Temple, but you need to be aware of them and generally pick a side in the feud
It's in our tenets to not bother others with our troubles, and doing so airs the dirty laundry that we have a weakness which should never be done. While it's fine and dandy to comfort others if it brings us happiness to do so, we should generally keep our problems to ourselves.
Talk about your issues. Do it to the people who want to help, and listen to what they have to say so you can move past it all the faster.
As a Satanist you are responsible for correcting misconceptions about the religion whenever you hear them, no matter who has the misconception, what the misconception is, and if they ask you if you're a Satanist, you should tell them