No, Satan is merely a symbol & an archetype. They may use the word 'Satan' but its not meant to be taken literally. It represents as you said a way of life.
1. They do not believe in demons & forces but if I am not mistaken, Lavey believes that curses can work if the subconscious mind is used. Blackmass is more of a mockery of christianity then a 'magickal ritual'. But its not just a mockery,it represents self deification & sort of being your own god.
2. No, they do not believe in hell. Almost everything is an archetype which represents 'free will' & our nature to indulge rather than summoning infernal forces.
"And with strange aeons, even death may die."
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