This is a quote from
wikipedia.org about the mystery cult of Osiris:
The Osirian Sacrament
Although there were ethical and ceremonial considerations none of these could compare to the power of the divine eucharist, since it was literally believed to be the body (bread) and blood (ale) of the god. Since the ancient Nilotics believed that humans were whatever they eat, this sacrament was, by extension, able to make them celestial and immortal. The doctrine of the eucharist ultimately has its roots in prehistoric cannibalism, whose practitioners understood that virtues and powers of the eaten can be thus absorbed by the eater. This phenomenon has been described throughout the world.
One of the oldest of the Pyramid Texts is the Unas from the 6th Dynasty (circa 2500 BC). It shows that the original ideology of Egypt commingled with Osirian concepts. Although ultimately given a high place in heaven by order of Osiris, Unas is at first an enemy of the gods and his ancestors, who he hunts, lassoes, kills, cooks, and eats so that their powers may become his own. This was written at a time when the eating of parents and gods was a laudable ceremony, and this emphasizes how hard it must have been to stamp out the older order of cannibalism. “He eats men, he feeds on the gods…he cooks them in his fiery cauldrons. He eats their words of power, he swallows their spirits…. He eats the wisdom of every god, his period of life is eternity…. Their soul is in his body, their spirits are within him.” A parallel passage is found in the Pyramid Text of Pepi II, who is said to have “seizeth those who are a follower of Set…he breaketh their heads, he cutteth off their haunches, he teareth out their intestines, he diggeth out their hearts, he drinketh copiously of their blood!” (line 531, ff).
Although crude, this was a core concept, the conviction that one could receive immortality by eating the flesh and blood of a god who had died became a dominating obsession in the ancient world. Although the cult of Osiris forbade cannibalism, it did not outlaw dismemberment and eating of enemies, and practiced the ritual rending and eating of the sacred bull, symbolizing Osiris.
Although this sacramental concept only originated once in history, it spread throughout the Mediterranean area and became the dynamic force in every mystery cult. It was only by this sacerdotal means that the corruptible deceased could be clothed in incorruption and this idea appears again and again in infinite variety. The scribe Nebseni implores: “And there in the celestial mansions of heaven which my divine father Tem hath established, let my hands lay hold upon the wheat and the barley which shall be given unto me therein in abundant measure” (Ibid. LXXII). Nu corroborates that this is the eucharist by saying: “I am established, and the divine Sekhet-hetep is before me, I have eaten therein, I have become a spirit therein, I have abundance therein.” (Ibid. LXXVII) Again Nu states: “I am the divine soul of Ra…which is god…I am the divine food which is not corrupted” (Ibid. LXXXV). The ancientness of the concept is again reaffirmed in the Pyramid Text of Teta (2600 BC) where the Osiris Teta “receivest thy bread which decayeth not, and thy beer which perisheth not” In the Text of Pepi I we read: “All the gods give thee their flesh and their blood…. Thou shalt not die.” In the Text of Pepi II the aspirant prays for “thy bread of eternity, and thy beer of everlastingness” (Line 390).
I’m in no way arguing against Catholic doctrine. I’m merely trying to address a point that many secular scholars and historians seem to use in order to show that Christianity is neither original nor revelation-based.