Why would anyone chose to worship the devil?

I’m not talking about movements like the Church of Satan, whose founder, Anton Szandor LaVey did not believe in any gods or demigods, and instead used the supposed absence of such deities as an excuse to revel in Earthly pleasures. Disagree as I might with the Church of Satan, I get what they are about. But what of those who believe that Satan or the Devil really does exist, and deserves to be worshiped? The only foundation for Satan’s existence, as far as I know, is sacred religious texts. And each of these places Satan in a distinctly subservient role to God. So why would someone read such a text, and then decide to worship Satan, Lucifer, Pan, Baphomet, Morgoth, or Yama and ignore God?