[Turbamulta]

Stories from the life of Horus had been circulating for centuries before Jesus birth (circa 4 to 7 BCE). If any copying occurred by the writers of the Egyptian or Christian religions, it was the followers of Jesus who incorporated into his biography the myths and legends of Horus, not vice-versa.

Why not? Others did it.

Justin Martyr (160 A.D.) wrote in his Dialogue of Justin and Trypho:

Be well assured, then, Trypho, that I am established in the knowledge of and faith in the Scriptures by those counterfeits which he who is called the devil is said to have performed among the Greeks; just as some were wrought by the Magi in Egypt, and others by the false prophets in Elijah's days. For when they tell that Bacchus, son of Jupiter, was begotten by intercourse with Semele, and that he was the discoverer of the vine; and when they relate, that being torn in pieces, and having died, he rose again, and ascended to heaven; and when they introduce wine into his mysteries, do I not perceive that the devil has imitated the prophecy announced by the patriarch Jacob, and recorded by Moses? And when they tell that Hercules was strong, and traveled over all the world, and was begotten by Jove of Alcmene, and ascended to heaven when he died, do I not perceive that the Scripture which speaks of Christ, 'strong as a giant to run his race,' has been in like manner imitated? And when the devil brings forward Asclepius as the raiser of the dead and healer of all diseases, may I not say that in this matter likewise he has imitated the prophecies about Christ? . . . And when those who record the mysteries of Mithras say that he was begotten of a rock, and call the place where those who believe in him are initiated a cave, do I not perceive here that the utterance of Daniel, that a stone without hands was cut out of a great mountain, has been imitated by them, and that they have attempted likewise to imitate the whole of Isaiah's words?

All that "researches" about the relation of Christianity and previous pagan religions are almost all crap. The most well-known of that "researches" is The World's Sixteen Crucified Saviors. Lots of laughs insured.