With Satanism there are many types. There's theistic Satanism, where people in it believe in satan and demons but in a different light. They don't see these beings as evil. Most view their demons as the original ancient gods. They incorporate their beings into magic.
There's LaVeyan Satanism, which is really an atheistic type. They don't believe in any gods or the actual satan. They believe that humans can perfect themselves into gods through their spiritual power in magic. They see satan as mainly symbology.
there may be other variations but I'm not sure. both do believe in individualism though.
That's a really great explanation, in a short easy way to understand. I'm a Satanist and for more in the first category, but always find it hard to explain to others. There's never one category a person fits into, in my opinion. There is always something that doesn't quite fit, or you like things from other religions.
If you want to talk about this more, or have questions feel free to message me.
I've studied different flavors of Satanism depends on their belief system and see Satan as with yourself or an actual being outside of the self.LaVeyan, Theistic/SpiritualLuciferianism, Anti-Cosmic Tradition, Order of the Nine Angles,and their is another tradition where you mix Lord and Lady Death into Satanism.
As a chaoteI see Satan like I see his twin Yahweh or whichever names they go by. Also symbolism of anti-creation and one of the gatekeepers of the abyss.