It's not easy to kill a god, but there are ways. Listed here are all deities thought or known to be dead.
“Lissala (pronounced lis-SALL-uh) was once a major religious force in the empire of Thassilon...Lissala
“The mysterious god known only as the Peacock Spirit had much to do with the rise of the empire...Peacock Spirit
“Curchanus is a mostly-forgotten god who reigned over beasts, travel, and endurance. While Desna...Curchanus
“The warrior-goddess Arazni was the herald of Aroden, and the patron saint of the Knights of Ozem...Arazni
“Dou-Bral was the son of the spirit-wolf Thron, and half-brother of the goddess Shelyn. Together...Dou-Bral
“The imams of the Windswept Wastes, in Casmaron, keep alive the legend of the ancient hero...Namzaruum