Styx strikes me as the contrarian type and not the secretly evil type. If you watch his Why I left Satanism video, he admits that the religion is a joke to make fun of Christians and he joined the church thinking that they would explain the lore behind demons. However, everyone he talked to who was a Satanist admitted to it being a larp and were largely doing it to piss off their family. I scenerily doubt Styx believes in demonology or the occult and just thinks the lore and science around it is cool.
Something to remember is that Styx got popular off of Christian bashing, but managed to transition into politics when that fad died out. He only really seems to bring it up nowadays to troll the boomers in his audience, or claim that he's a Libretarian who would be left-leaning if the Democrats had not completely been overrun by Communists.
Video in Question: