Be careful about what you read concerning Egypt and thier similarities. Some of what has been taught in the internet is inaccurate. Example, Jesus is a remake of Horus, not true and many of the things said about Horus can't be found in any place in Egypt.
Take that up with the Egyptologists that predate the Internet, because from every single thing I have ever read about Osiris/Isis/Horus, the similarities are quite clear. It was clear in the late 19th and early 20th century too, Pagan Origins of the Christ Myth and all.
The story of Set killing his brother Osiris and Horus avenging him after Osiris conquers the world of the dead sounds a lot like the Lion King, as well. It's the monomyth, the Hero's Journey. Of course it was used to fill out the narrative of Jesus.