Why were Anubis and Osiris deities?

They were deities because people made them up that way. Anubis and Osiris share some of the duties of the dead. Osiris was killed by Set and torn to pieces, put back together by his wife Isis and they had a son Horus after that. read more

Anubis was the jackal-headed Egyptian god of death and embalming, and is said to be the son of Osiris by Nepthys, although in some legends his father is Set. It is the job of Anubis to weigh the souls of the dead, and determine whether they were worthy of admittance to the underworld. read more

Osiris and Anubis. Later, when the theology of Heliopolis (the Ennead) and Hermopolis (the Ogdoad) were merged, Osiris tookover Anubis's role as the god of the underworld (although he remained central to funerary rights). read more

Despite being one of the most ancient and "one of the most frequently depicted and mentioned gods" in the Egyptian pantheon, Anubis played almost no role in Egyptian myths. Anubis was depicted in black, a color that symbolized both rebirth and the discoloration of the corpse after embalming. read more