Hi, thanks for the comment.
Just a note: what you're describing is a position known as gnosticism, not Satanism. The gnostics believe in an essentially Christian worldview but flip around the traditional views of God and the devil. In Satanism, we do not believe in any deity beyond ourselves and Satan is a symbol of our own potential.
The belief in a deity known as Satan or Lucifer as sole deity may also be called luciferianism, this is also not Satanism but rather its own unique religion.
I tend to view all theistic beliefs as fundamentally delusions, as do other Satanists. Such beliefs arised in a pre-scientific era to explain how the world works and have stuck around due to what LaVey called "man's need for fantasy".
I prefer not to delude myself and turn to fiction that is honest about being fiction to get my fix of fantasy.
RE: The devil you say... a real Satanist commenting on "The satanic temple"