Fred Phelps was a terrorist. He targeted innocent people and didn’t care who he inflicted harm upon. The fact that he based his actions on religion neither mitigates nor magnifies it; whatever message he had was lost in the delivery.
As a Quaker I’m lead to believe that every life has worth. In the case of Fred Phelps, his life was a cautionary tale that hatred can consume and torture the one who generates it as well as the intended target. Since I don’t believe in a heaven or a hell, I can only hope that when the Light went out in his life, it moved on to someone who can use it for good, for love, and for caring.