The idea of a living incarnation of a God who is killed and who rises again is not unique at all.
An epithet of ancient Egyptian kings was 'The Living Horus' - a god incarnated in human form.
The belief in Horus as the god resurrected at dawn, Re-Horakhty as the mid-day sun and Osiris as the 'dead' sun - symbolically, of course, once it had slipped beneath the horizon - is just one example.
Belief in - and veneration of - dying and resurrected gods was both widespread and commonplace: Dionysus, Adonis, Attis, Mithra, Tammuz, Osiris and of course, Jesus are all dying and resurrected god-men.
Have you read James George Frazer's The Golden Bough, a study in comparative religion, published in 1890?
It is well worth a read, irrespective of one's own faith - or, in my case, faithlessness.
You could do worse than begin here for an holistic summary of dying and rising deities: