As I keep pointing out, it's not my claim. It's the claim of Paul, who was personally picked by Jesus Christ himself to be a disciple and an apostle.
1Co 15:44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
1Co 15:45 And so it is written, The first man Adam was made a living soul; the last Adam [was made] a quickening spirit.
Jesus says:
Joh 17:5 And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was.
What did Jesus mean here? Was he with God the father and made out of flesh and bone even before flesh and bone was created through him? If we accept your premise that Jesus Christ today is made out of a flesh and bone body, and not a spiritual body, then he must have been flesh and bone before. Right?
God the son says God is spirit. Jesus Christ is God. :
Joh 4:24 God [is] a Spirit: and they that worship him must worship [him] in spirit and in truth.
Your interpretation of a verse contradicts an entire chapter of the bible, written by a man who knew the resurrected Jesus Christ. Not only that, it contradicts one direct statement saying that God is spirit, and another saying that Christ wanted to return to the same glory he had BEFORE the world was made.
When there is a contradiction, I feel safer believing the bible.