Check out some of the other "virgin born / savior / crucifixion" stories that this one is based on. They might offer more clues.
Here's a start: A quote from www.infidels.org...
More than twenty claims of this kind -- claims of beings invested with divine honor (deified) -- have come forward and presented themselves at the bar
of the world with their credentials, to contest the verdict of Christendom, in having proclaimed Jesus Christ, "the only son, and sent of God:"
twenty Messiahs, Saviors, and Sons of God, according to history or tradition, have, in past times, descended from heaven, and taken upon themselves
the form of men, clothing themselves with human flesh, and furnishing incontestable evidence of a divine origin, by various miracles, marvelous works,
and superlative virtues; and finally these twenty Jesus Christs (accepting their character for the name) laid the foundation for the salvation of the
world, and ascended back to heaven.
1. Chrishna of Hindostan.
2. Budha Sakia of India.
3. Salivahana of Bermuda.
4. Zulis, or Zhule, also Osiris and Orus, of Egypt.
5. Odin of the Scaudinavians.
6. Crite of Chaldea.
7. Zoroaster and Mithra of Persia.
8. Baal and Taut, "the only Begotten of God," of Phenicia.
9. Indra of Thibet.
10. Bali of Afghanistan.
11. Jao of Nepaul.
12. Wittoba of the Bilingonese.
13. Thammuz of Syria.
14. Atys of Phrygia.
15. Xaniolxis of Thrace.
16. Zoar of the Bonzes.
17. Adad of Assyria.
18. Deva Tat, and Sammonocadam of Siam.
19. Alcides of Thebes.
20. Mikado of the Sintoos.
21. Beddru of Japan.
22. Hesus or Eros, and Bremrillah, of the Druids.
23. Thor, son of Odin, of the Gauls.
24. Cadmus of Greece.
25. Hil and Feta of the Mandaites.
26. Gentaut and Quexalcote of Mexico.
27. Universal Monarch of the Sibyls.
28. Ischy of the Island of Formosa.
29. Divine Teacher of Plato.
30. Holy One of Xaca.
31. Fohi and Tien of China.
32. Adonis, son of the virgin Io of Greece.
33. IxiOn and Quirinus of Rome.
34. Prometheus of Caucasus.
35. Mohamud, or Mahomet, of Arabia.
These have all received divine honors, have nearly all been worshiped as Gods, or sons of God; were mostly incarnated as Christs, Saviors, Messiahs,
or Mediators; not a few of them were reputedly born of virgins; some of them filling a character almost identical with that ascribed by the
Christian's bible to Jesus Christ; many of them, like him, are reported to have been crucified; and all of them, taken together, furnish a prototype
and parallel for nearly every important incident and wonder-inciting miracle, doctrine and precept recorded in the New Testament, of the Christian's
Savior. Surely, with so many Saviors the world cannot, or should not, be lost.