is it okay to believe everything we know about Satan including guardian demons and rituals but not believe that he came from another planet?

i hear people talking that Satan is an extraterrestrial and that he came from another planet?? is this what this group believes? i Thought this group practiced Theistic Satanism or Spiritual Satanism? 

I was wondering what type of Satanism it is that this group practices. i have heard that there are many types of Satanism such as LeVayan or Theistic and wanted to know which type this group is.

A friend told me when becoming a Satanist you are to choose a demon to protect you and guide you. Is this correct?

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