Osiris to Jesus f
A visual overview of how the Egyptian religio-mythology model of the the rising of Osiris from the dead became the Roman story of the resurrection of Jesus from the dead. [N1]
In queries, How Osiris Became Jesus refers to the overly-common puzzlement of how, according to Christ myth theory, the polytheistic Egyptian religio-mythology story of death and resurrection of Osiris became the monotheistic Roman recension story of the death and resurrection of Jesus.

In modern times, recent popular films, e.g. The God Who Wasn’t There (2005) (Ѻ)(Ѻ), by Brian Flemming, the viral Zeitgeist (2006), by Peter Joseph, and Religulous (2008), featuring Bill Maher, building on the more involved published work of the 120+ religio-mythology scholars, each talk generally about or allude to the conclusion that the story of Jesus as a re-telling, rescript, redaction, or recension (see: recension theory) of the Osiris myth (see: Passion of Osiris), and or a rewrite (or syncretism) of the the god Horus, the son of Osiris. The specifics of how this occurred, over the course of the last five-thousand years, however, is involved, to say the least.

In short, Egyptians, in the 1st dynasty (3,100BC), believed that what occurred annually to their land, e.g. the annual 150-day Nile River flood (see: Noah's flood), the 70-day disappearance of the star Sirius, the rebirth of the heat of the dying sun on Dec 25, was mirrored in the the sky, i.e. the constellations (e.g. Orion), sun, moon, stars (e.g. Sirius) of whom (see: astro-theology) were conceived of as gods or pharaohs-as-gods.

Accordingly, the centerpiece of this belief system was annual Dec raising of the Orion constellation, Orion, with is three star belt buckle, conceived as a great pharaoh, riding on a boat in the Nile mirrored of the heavens. Orion at this point in time was conceptualized as the god Sah.

In 2800BC, Sah, aka the Orion constellation, comprised of 14 stars, became synretized into the god Osiris. To "raise" the perceptually to the eye "dead" god Osiris, from the late Nov dead position (lying horizontal in the sky) to the "alive" or upright position, as seen in late Dec (about Dec 25), another constellation god, called Anubis (aka John the Baptist, as he became during the Roman recension), had to perform the so-called "opening of the mouth" (Ѻ) ceremony, using a "tool" [add name] representative of the big dipper, that would let "air" or "water" into the mouth of the dead Orion (Osiris) constellation, therein bringing him back to life, in the judgment hall of the heavens.

In 100BC to 200AD, with the rise of Roman power, concordant with the decline of Egyptian power, the new Roman emperors ordered a new religion to be made that would unit the the empire, similar as had what had been done in all previous recensions (see: recension theory), e.g. in 332 to 305BC, Alexander the Great attempt, in the “Greek recension “, to merge the Greek god Zeus-Amon with the Egyptian god Amen-Ra to make a new syncretistic god (see: supreme god timeline), or how in 1352BC the Egyptian pharaoh Akhenaten attempted to make Aten the sole god of Egypt.

This began, generally, with Roman emperor Nero, in 54-68AD, worshiping the Egyptian gods Isis and Osiris, depictions of which are shown in Dendera Temple.

In 337AD, by the time of the Nicaean creed (325AD), things had become homogenized to the effect that the ancient story of the Osiris being cut into 14 pieces (# of stars of the Orion constellation), then put back together, then mummified, and resurrected from the dead after three days, became the monotheistic story of the Jesus being “crucified”, then being wrapped in linen, then rising from the dead after three days.

In c.800AD, the practice of mummification was outlined by the Roman empire, after which the connected between Jesus and mummification began to attenuate into a rug swept topic; in modern times, the connection between Jesus and mummies is so remote, that is near laughable, to the ignorant mind, when mentioned.

Roman Recenstion (Osiris & Horus to Jesus)
A visual overview of how, amid the Roman recension, the Egyptian god Osiris was split three ways into: Jesus Crucified, God the Father, and Lazarus (see: Raising of Lazarus); Anubis became John the Baptist; and Horus became Jesus the infant born to a virgin Mary (see: Isis), in short. [N2]
Of note, there exists a bit of unavoidable confusion as to whether the god Osiris OR the god Horus is main pre-script to the fictional figure of Jesus; the following is a recent evidenced confusion example:

“The assertion that Osiris’ son Horus has the exact same bio of Jesus is just based on misinformation. This is garbage that’s spread on the Internet, that just isn’t true. What’s funny about this is that these people who say this kind of thing, never seem to quote the primary sources. They tell you that this is in Osiris OR Horus, but you never see the primary sources quoted. When you look at the primary sources, you find out that they’re not at all parallel.”
William Craig (2012), response (Ѻ)(Ѻ) to audience member who asks about the Osiris/Horus and Jesus parallel, Feb 24

The general issue here, in short, is that originally, in pre-Dynastic Egypt (c.3500BC), Horus and Osiris were two completely different and unrelated gods, and Horus, in fact, as Wallis Budge has pointed out, is the "oldest god of all" the Egyptian gods; most of the first pharaohs, e.g., all had "Horus names" (i.e. "Hor"), e.g. Iry-Hor (c.3150) (Ѻ), written written with the Horus falcon hieroglyph (Gardiner sign G5) above a mouth hieroglyph (Gardiner D21), was the 1st pharaoh (Ѻ) of the 0th Dynasty.

When, however, after the Heliopolis recension (c.2800BC) of Egyptian mythology (see: Heliopolis creation myth), occurred, wherein henotheism (one supreme god ruling over one paut or god family) took shape, Horus and Osiris were merged into one god family creation myth. Moreover, it wasn't until the 20th Dynasty (1189-1077 BC), in Thebes, that Osiris moved into the supreme god (see: supreme god timeline) position parallel in power to that of Ra (therein becoming the syncretistic god Osiris-Ra). A full read-through of Wallis Budge's two-volume The Gods of the Egyptians (1904) is requisite to fully discern the big picture view that Osiris and Horus, originally, were TWO different and unrelated gods. By the time of the Roman recension (50BC to 300AD), as compared the 1st Dynasty Egyptian recension (3200-2900BC), the picture of things was quite different. The stories on the walls of the Dendera Temple paint the basic picture of how Osiris and Horus were viewed at the time (30AD) of the fiction retrospective invention of the Jesus character.

N1. The "Jesus Mummy" shown, with halo (sun disc) and gold Jesus necklace, was the 2016 Halloween costume worn by Libb Thims at his 25+ person Halloween party, with which he had intended to make an Atheism Reviews video, to educate people to the fact that "Christ", as Gerald Massey (1907) has pointed out, means mummy, and that originally Jesus, in conceptual model, prior to his later Roman Catholic white male poster boy polishing, was originally a mummy; most people, e.g., are ignorant of the fact that the halo of Jesus is actually a sun disc, representative of the re-born sun (aka the god Ra, in short).
N2. Note, the book Jesus holds is Dorothy Murdock's Christ in Egypt (2008).

Further reading
● Harpur, Tom. (2004). The Pagan Christ. Thomas Allan Publishers.
● Thims, Libb. (2016). Smart Atheism: For Kids (pdf | 309-pgs). Publisher.

External links
Is Jesus a Remake of Osiris? – TruthBeKnown.com.

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