A couple of problems, who was the manifestation or prophet that brought "religion" to the Greeks? Or, was Greek religion all man-made superstition and mythology?
I don't know any Manifestations appearing among Greeks, but Baha'i Scriptures states that the Greek Philosophers were inspired by Jewish saints.
And, about incarnations, Hinduism, a true religion according to Baha'i teachings does have Krishna as an "incarnation" of God.
They also call Him "manifestation of God", but they probably have a different understanding that what a Manifestation means.
And last, I still want to know if Jesus isn't God in the flesh, that all references that implied that are only meant to be figurative, and if he didn't rise from the dead physically, what did he really do and accomplish?
I quote from Baha'u'llah:
"Know thou that when the Son of Man yielded up His breath to God, the whole creation wept with a great weeping. By sacrificing Himself, however, a fresh capacity was infused into all created things. Its evidences, as witnessed in all the peoples of the earth, are now manifest before thee. The deepest wisdom which the sages have uttered, the profoundest learning which any mind hath unfolded, the arts which the ablest hands have produced, the influence exerted by the most potent of rulers, are but manifestations of the quickening power released by His transcendent, His all-pervasive, and resplendent Spirit.
We testify that when He came into the world, He shed the splendor of His glory upon all created things. Through Him the leper recovered from the leprosy of perversity and ignorance. Through Him, the unchaste and wayward were healed. Through His power, born of Almighty God, the eyes of the blind were opened, and the soul of the sinner sanctified.
Leprosy may be interpreted as any veil that interveneth between man and the recognition of the Lord, his God. Whoso alloweth himself to be shut out from Him is indeed a leper, who shall not be remembered in the Kingdom of God, the Mighty, the All-Praised. We bear witness that through the power of the Word of God every leper was cleansed, every sickness was healed, every human infirmity was banished. He it is Who purified the world. Blessed is the man who, with a face beaming with light, hath turned towards Him."
Bahá'í Reference Library - Gleanings From the Writings of Baháulláh, Pages 85-86
Since Paul did say in the NT that if he hasn't risen from the dead that Christians are still in their sins.
The disciples of Jesus became like the Body of Christ, meaning that they were in Christ and Christ in them, just as the Father was in Jesus, and Jesus in the Father, meaning that the attributes of God was in Christ and also in His disciples. After Jesus was Crucified, the disciples were troubled, and for three days they who were the Body of Christ, were not teaching the cause of God. But after three days they, who were the Body of Christ rose to teach, hence the Body of Christ is said to be raised after three days.