In the movie "Zeitgeist", Peter Joseph says, "This is Horus. He is the Sun God of Egypt of around 3000 B.C. He is the sun, anthropomorphized and his life is a series of allegorical myths involving the sun's movement in the sky."
Other than the fact that he's from Egypt around 3000 B.C., all of this is false. The Egyptian sun God is Ra, Not Horus. Horus is associated with the sun, as are most Egyptian deities, but he is hardly "the" Sun God.
Joseph then goes on to talk about Horus and his enemy, Set, metaphorically battling every morning, where Horus would win the battle, and every evening, where Set would win the battle, which he says corresponds to the sun rising (Horus winning) and setting (Set winning and sending Horus to the underworld). Except for Horus defeating Set, none of this is part of Egyptian mythology. Set never defeats Horus, Horus never goes to the underworld, and in no metaphorical way does this happen daily. Most of Joseph's claims seem to be completely imagined, the work of someone totally unfamilair with Egyptian mythology. The Zeitgeist sourcebook only confirms that they battled, never showing evidence that it happened daily.
"Broadly speaking, the story of Horus is as follows:
Born on Dec 25th
Born of a virgin
Star in the East
Adored by 3 kings
Teacher at 12
Baptized/ministry at 30
"Lamb of God"/"The Light"
Dead for 3 days
Hardly any of this applies to any pre-Christian version of the Horus story. There are several birthdates assigned to Horus, one of which is sometime around the winter solstice (usually December 21st or 22nd), though the exact date is not clear. However, it hardly matters, since Jesus was almost certainly not born on 12/25. That date was assigned long after Jesus' time, with no evidence that it corresponds to Jesus' actual birthdate. There's about a 1 in 365 chance of it being correct (probably less, actually, since warmer weather is suggested in the Biblical texts).
Horus being born of a virgin is iffy. None of the stories seem to suggest that Isis was a virgin, though I've seen a few university-level scholar who see to think she was.
And, yes, Horus did perform miracles, though none that would correspond to Jesus' miracles. No walking on water, resurrecting dead people, water into wine, etc.
Horus had no star in the east, wasn't adored by 3 kings, wasn't a teacher at age 12, was never baptized, did not begin his ministry at age 30, didn't have 12 disciples, was never called "The Lamb of God" or "The Light", wasn't crucified, wasn't dead for three days, and was never resurrected. There is zero evidence for these claims being part of pre-Christian mythology - no stories where they happen, no images of them happening, or anything.
Those who will tell you that these things were part of the ancient Horus story have never seen the evidence, but only seen so-called "scholars" (none of them university-level) claiming these things to be true.