Satan is Shiva , same Being. But we are the One's who know His many names and way more then what other belief's and religion's are saying and knowing about Him.
It’s the same, kalabhairava is the terrifying form of shiva, originated in tantra, which means that this aspect of the deity is used to remove blockages, for the deepest and most total purification and for protection, removal of negative karma. Shiva is the most known aspect and is the aspect of the god and is the most peaceful, shiva sits in meditation and has a peaceful look. They are the same being only in different forms, you can approach the different forms of the deity based on what you need and based on your characteristics.
“Shankara” means peace and is a term for the crown chakra as well as a name of the god shiva