OK, step one. The reference to flesh giving birth to flesh and spirit giving birth to spirit when read in context is a clear reference to a natural birth (the first) and a quickening by the spirit at our second birth at the point of our conversion, NOT any sort of spiritual birth at our physical resurrection. This in fact militates against your argument in that it implies a spiritual existence acceptable to God in our flesh. Why do I say that? Paul clearly states that in our reginerate state we can walk boldly into the throne room of God without fear of being incinerated for our impertinence. The reference to the notion that God is made more perfect by taking on flesh is a complete red herring. The scripture clearly states that Christ was perfected by suffering, which the word seems to imply is possible either in spirit or in flesh. It is a more reasonable argument to maintain that it is necessary for Christ to remain in the flesh in order to serve in his role as intermediater between man and God, as it is necessary for an intermediater to partake of the circumstances of both parties. I don't see how anything in the preceding argument forces anything out of the gospels that isn't there, but I do think your's does.
The assertion that Christ in his current state might be said to once again be taking on the glory of the Father is dicey, One might argue that each member of the Godhead has a glory that is fully deity but unique to each members role, a proposition I am more comfortable with but you might be able to debate me out of. Regardless of this, there is nothing in the scriptures that implies that having a flesh body precludes one from having a perfect and divine nature. That assertion is a first principle in Christian theology when considering the nature of Christ, fully man, and therefor flesh, and fully God, and therefor perfect.
I don't know about that assertion that in our perfected state we are to be one with God, that sounds vaugely Buddist. We are to be like God, but just as Christ was fully God and fully man in his earthly ministry, we will be fully Godlike and fully men and women in glory, neither IN SCRIPTURE precludes the other.
Your first paragraph is all through the lens and understanding of men, men of flesh. In other words, it is logical according to how those who know only the things of this world and are just learning of heavenly things (and yet mostly not learning) would tend to imagine. It's as if Jesus announced that we must be born again...and no one played the roll of Nicodemus allowing Jesus' heavenly logic to prevail in the exchange--leaving men to surmise something that did not offend their human worldly logic.
I get it. It just isn't so. And yes, I invoke "
If I have told you earthly things and you do not believe, how will you believe if I tell you heavenly things?"
Second paragraph: Still human worldly logic at work. As for the scriptures, of course it is there: The elements included in the creation are to be dissolved with fervent heat and with fire. But don't misunderstand when it come to Christ...Christ is not what shall be, but is rather limited to the sacrifice for sin. By definition, this is the very thing that qualified Christ to pay the price for sin--that He was indeed a man. Which is to say that He too was formed of the dust of the ground, the elements that are to be dissolved. What did you think--that since Jesus gave His body to the church, that He is now with the Father bodiless? Or that He did not give His body to the church after saying otherwise, but is withholding until He returns, and that we will then all take our places in His garment? Again, these things are the concoctions of human logic, things that have not even been thought out by most who now swear by them.
But I will tell you: "
To live is Christ" was not stated by Paul in arrogance, but was ordained by the power of God in Christ for His church. The church is His body, but just as Paul preached, we "
do not sow that body that shall be, but mere grain—", but rather, it dies and returns to the dust and is dissolved, leaving only the spirit.
So, no, Jesus did not drag his flesh body into heaven, but gave it to the church until the times are fulfilled. And going to the Father and being One never meant anything to do with the flesh.
Third paragraph: "vaguely Buddhist?" No...not even close, but rather the prayer of Christ:
“I have manifested Your name to the men whom You have given Me out of the world. They were Yours, You gave them to Me, and they have kept Your word. 7 Now they have known that all things which You have given Me are from You. 8 For I have given to them the words which You have given Me; and they have received them, and have known surely that I came forth from You; and they have believed that You sent Me.
9 “I pray for them. I do not pray for the world but for those whom You have given Me, for they are Yours. 10 And all Mine are Yours, and Yours are Mine, and I am glorified in them. 11 Now I am no longer in the world, but these are in the world, and I come to You. Holy Father, keep through Your name those whom You have given Me, that they may be one as We are. 12 While I was with them in the world, I kept them in Your name. Those whom You gave Me I have kept; and none of them is lost except the son of perdition, that the Scripture might be fulfilled. 13 But now I come to You, and these things I speak in the world, that they may have My joy fulfilled in themselves. 14 I have given them Your word; and the world has hated them because they are not of the world, just as I am not of the world. 15 I do not pray that You should take them out of the world, but that You should keep them from the evil one. 16 They are not of the world, just as I am not of the world. 17 Sanctify them by Your truth. Your word is truth. 18 As You sent Me into the world, I also have sent them into the world. 19 And for their sakes I sanctify Myself, that they also may be sanctified by the truth.
20 “I do not pray for these alone, but also for those who will believe in Me through their word; 21 that they all may be one, as You, Father, are in Me, and I in You; that they also may be one in Us, that the world may believe that You sent Me. 22 And the glory which You gave Me I have given them, that they may be one just as We are one: 23 I in them, and You in Me; that they may be made perfect in one, and that the world may know that You have sent Me, and have loved them as You have loved Me.
24 “Father, I desire that they also whom You gave Me may be with Me where I am, that they may behold My glory which You have given Me; for You loved Me before the foundation of the world. 25 O righteous Father! The world has not known You, but I have known You; and these have known that You sent Me. 26 And I have declared to them Your name, and will declare it, that the love with which You loved Me may be in them, and I in them.”
And here also:
1 Corinthians 15:28
Now when all things are made subject to Him, then the Son Himself will also be subject to Him who put all things under Him, that God may be all in all.