This is just misused pagan symbols, chances are none of these artists have a fucking clue where these symbols are coming from.
Witch house is where the really raw shit is, Nicolas Jaar is the man. So many other artists doing this kind of stuff too, but most of them are fairly unknown. In the end it almost all stems from neopagan religions like Wicca, which developed during the 60s and 70s and was hugely underground until recently. Summoning circles and pentagrams are prevalent in Wicca, and the christian cross is simply representative of the four elements, coming from the celtic cross, which is an aspect of pagan religions.
In the end its not an occult theme - because the symbols are being misused, and if they are referencing Wicca, it wouldn't be occult, because Wicca is not occult in any way. Its a misinterpretation of the witch mythology.
But in this case I'd say they're trying to use the symbols to represent an anti-authoritarian viewpoint, and a sort of dark, underground vibe.