One thing you must realize is that we, "humans" are not pure "flesh and blood." We DO have spirit INSIDE us. For it is the "spirit that IS life, the flesh is of NO USE AT ALL." (John 6:63)
When God formed Adam, he blew into his nostrils the "spirit of life" which is holy spirit. Such spirit was so powerful that it can make any non-living thing, "living." We are spirits "clothed" in fleshly "vessels." These bodies are temporary, and they hold the spirit of men, temporarily. Once the flesh dies, the spirit "returns to the God who gave it." From there, it goes wherever God chooses to put it.
That is why when Stephen was being stoned, he cried out, "Lord Jesus, recieve my spirit."
Of the Father, Zechariah says:
"The burden of the word of Jehovah concerning Israel. Thus saith Jah, who stretches forth the heavens, and lays the foundation of the earth, and FORMS the spirit of man within him: " Zech. 12:1
Thus the 'spirit' of man INSIDE him, has a FORM. Just like the flesh was "formed" from that which is earthly, the spirit was formed from that which is heavenly. Hence, "nothing new under the sun."
The flesh is just a vessel, nothing more. Jesus knew this and thus he said, "the flesh is of NO USE AT ALL."
Peace to you,