The validity of the Gospels is challenged by writers such as Kersey Graves who claimed that mythic stories, that have parallels in the life of Jesus, support the conclusion that the gospel writers incorporated them into the story of Jesus[14] and also Gerald Massey,[15] who specifically claimed that the life story of the Egyptian god Horus was copied by Christian Gnostics.[16] Parallels have also been drawn between Greek myths and the life of Jesus. The comparative mythology of Jesus Christ examines the parallels that have been proposed for the Biblical portrayal of Jesus in comparison to other religious or mythical domains. Some critics have alleged that Christianity is not founded on a historical figure, but rather on a mythical creation.