Interesting video, but nothing new. The unfortunate fact is that the majority of the video has little evidence to back it up.
Take this site:
This site itemizes the same similarities between Horus and Jesus. As its basis for evidence, it uses the "Egyptian Book of the Dead" that details the story of Horus. This book predates Jesus by I believe about 1200 years (if memory serves, I think the vid says that the story is 3000 years old, but with no evidence).
Unfortunately, for the author of this page (which very well could have been used by the maker of this video), the internet also happens to have a complete translation of the Egyptian Book of the Dead. While I admit that I only did cursory searches for support for the claims listed on the above site and in the video, I found NOTHING to support any claims.
No mention of virgin birth. No mention of December 25th, for that matter (on that subject, really briefly because I could write a book on this, possibly, lol - no Christian religious scholar in his or her right mind would deny the heavy presence of Pagan customs in Christian tradition. Heck, even what we call the Easter celebration is nothing more than a conversion of Pagan rituals performed BEFORE Christ. The same can be said of December 25th being used as the Christ birthdate).
I believe that popular opinion is that Catholicism (i.e., early Christianity) attempted to cleanse, if you will, popular Pagan cultural rites by converting them to Christian celebrations.
This, of course, in no way refutes the Christ story, you should note.
For instance, nowhere in the Bible will you find references to Jesus being born on December 25th or even having been crucified and resurrected during the Easter season!
On the subject of some of these other similarities, you will find that there is little to no evidence to back up most of these claims.
Moving on... most interesting, is the fact that ALL Dionysis/Osiris/Horus/Mithra references of "resurrection" that mirror Jesus all appear in documentation that was written AFTER Jesus!
See these YouTube videos for an interesting debate/discussion on this resurrection topic.