John, the video you linked to is a clip from Peter Joseph's
Zeitgeist: The Movie. The video is based in large part on the work of another pseudo-scholar, Acharya S. (aka D.M. Murdoch). A very good refutation, with many references to scholarly sources, is the following video by Elliot Nesch:
Zeitgeist Refuted Final Cut
Aside from the demonstrably false assertions about the births and lives of Horus et al., what I find really preposterous in the Zeitgeist clip are Joseph's three etymologies for the words, "horizon", "hours" and "sunset". As someone with decades-long interests in historical linguistics and Egyptology, the kindest thing I can say about them is that they're not even wrong. Here, I'll show you what I mean:
At 2:22 Joseph claims, "In fact the term 'horizon' comes from the phrase 'Horus has risen', denoting the sunrise." In truth the word comes from the Greek verb "horizein", meaning "to bound, limit, divide, separate". In turn, this verb derives from the noun "horos", meaning "boundary".
(Source:
http://www.etymonline.com/index.php?allowed_in_frame=0&search=horizon&searchmode=none)
At 2:30 he goes on to say, "'Hours' are also derived from 'Horus', as it is the sun tracked throughout the day." In reality, "hour" ultimately comes from the Greek "hora", meaning "any limited time". The English word "year" is a cognate of "hora", meaning, both words go back to a common Indo-European ancestor several thousand years in the past.
(Sources:
http://www.etymonline.com/index.php?allowed_in_frame=0&search=hour&searchmode=none, and
http://www.etymonline.com/index.php?term=year&allowed_in_frame=0)
At 2:34, Joseph traces the source of "sunset" to Horus's evil brother Set. "...while in the evening, Set would conquer Horus, and send him into the underworld, hence the term, 'sunset'." In fact, the second word in "sunset" has nothing to do with the god Set. It's simply the English word "set".
(Source:
http://www.etymonline.com/index.php?allowed_in_frame=0&search=sunset&searchmode=none)
It's disturbing that Peter Joseph didn't bother to research the true etymologies of these words. Instead, he made up his own or used someone else's (Acharya's?). In any case, these stupid errors cost him a lot of credibility, as far as I'm concerned. He lost the rest with his and Acharya's fictitious parallels between the lives of Jesus and the pagan gods.
Doug