I would argue that "every creature under heaven" is in reference to the fulfillment of the gospel going to both Jews and Gentiles. I would agree that there was a "coming of the Son of man" in judgment on Israel in 70 A.D., but I don't believe that this ushered in the new heavens and new earth. "Heaven and earth" (Mat 24:35) did not pass away when "this generation" (Mat 24:34) eventually passed away.Thank you for asking a specific question based on the Bible and not just a generalization.
First of all, I don't think this is physical creation that is being spoken of, but of people. Yes, many times ktisis is used of the physical world but it is also often used of people, and of the spiritual realm:
Mark 16:15; 2 Cor. 5:17; Gal. 6:15
"For in Christ Jesus neither circumcision avails anything, nor uncircumcision, but a new creature."
And Col. 1:23, which states in part:
"...the gospel ... which was preached [past tense!] to every creature which is under heaven ..."
I have a hard time accepting that the "thousand years" in Revelation 20 were really 40 years in the first century. While I would agree that the "first resurrection" is regeneration, I believe that the "second resurrection" is the physical resurrection into glorified bodies like Christ attained in His resurrection mentioned elsewhere.
In other words, the Fall brought a curse of sin and physical death on all creation, and there will be no final remedy for what the Fall caused? The earth will continue to abide forever? There will never be an end to sin and death through the progeny of Adam?All of this is to say that the improvement and restoration is not at all concerning physical death on this Earth, but new life in Christ. And glorification when we, Christians, go to be with the Lord.
I agree, we have it now in earnest, but our realization is not fully realized until we are glorified. When we are "asleep in Christ" we still do not have the "blessed hope" until we are "not found naked" at the final resurrection when "the last enemy that shall be destroyed is death." And if you don't have a final separation of sheep from goats in a final day of judgment, you never end the federal headship of Adam (Luk 29:34-38). The sons of this age marry, but those who are worthy to attain the age to come and the resurrection do not marry.Those who are in Christ "have passed from death unto life" already, John 5:24; 1 John 3:14; 5:24.
Sorry, but I don't see your understanding playing out in Romans 8.The groaning and pain that you cited above, AresMan, is the same that we find in Revelation, of the woman in childbirth. Specifically it is about the Church being born from among Jewish believers.
This Romans 8 passage the whole idea of pain in childbirth had earlier been found in places like Isa. 26:16-18. where Israel fails to give birth out of their own righteousness.
Birth, life, and death are all spiritually intended here in these passages.
The Jewish aspect of Romans 8:22ff is often overlooked, but it helps to remember that this passage leads up to the more obvious Jewish-themed Rom. 9-11.
In v.11 our mortal bodies will be made alive (c.f. 1Co 15:20-22).
In v.15 we have received the Spirit of adoption. The adoption is fully realized when our bodies are redeemed (v.23).
In v.22 the whole creation is groaning in travail from the Fall waiting for an end.
In v.23 we also (as the adopted sons of God) among the creation groan, but we know what our hope is--the redemption of our body. This will be manifest in "the glorious liberty" of the "manifestation of the sons of God" (v.19) when we are freed from the corruption of sinful flesh (v.21) and will finally rule over a restored creation in the resurrection where there will be no more marriage, no more sin, and no more progeny of Adam.