"Most Satanists do not accept Satan as an anthropomorphic being with cloven hooves, a barbed tail, and horns. He merely represents* a force of nature - the powers of darkness which have been named just that because no religion has taken these forces out of the darkness..." - Anton Szandor LaVey - The Satanic Bible p62

* My emphasis.

Notice that Dr. LaVey says, "Most Satanists...". This implies flexibility and individual choice.

On certain occasions, it might be useful to think of Satan as a "person", particularly if that person is yourself.