You can call it whatever you want. This is just taking 2nd temple eschatology, assuming the NT and apostles (especially Paul) was well engrossed in this, and applying it to the Christ event that ushered in new creation w/ his resurrection.
Depends... Hebrews seems to talk about entering the peace and rest of God.
And that is the Xian distinction from Judaism. Things happened not as expected. The Kingdom came, death was conquered, but sin still exists and reigns. It is a both/and. Christians, in the reign of God, experience the peace of God that surpasses understanding. Call it a spiritual reality if you like.
It is not a physical reality nor a spiritual reality.
Even Christians struggle with sin.
You would be denying the Word of God if you didn't admit that.
[FONT="]1 John 1:8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.[/FONT]
[FONT="]1 John 1:10 If we say that we have not sinned, we make him a liar, and his word is not in us.[/FONT]
Sin and peace are not mutually exclusive. As I mentioned, we have access to the peace of God that surpasses knowledge and the rest/shalom/sabbath provided by Jesus.
We're not going to agree on this, so this is moot.
If there is an overlap between the ages, all of this is easily explained. Jesus' resurrection has inaugurated new creation. But the present, evil age continues. So there is both peace and unrest.
The WEB says this: Hebrews 4:9 There remains therefore a Sabbath rest for the people of God.
10 For he who has entered into his rest has himself also rested from his works, as God did from his.
The author is writing to Christians with a Jewish background. They are discouraged because of persecution, and some of them are tempted to go back to the Temple, back to Judaism. That is the basic background of the book. Thus throughout there is the contrast of the two systems: one better than the other.
The Sabbath has been done away with. The Sabbath day was a day of rest.
We have a "better" Sabbath--a "Sabbath rest" for the people of God.
Those who have entered into His rest have rested from his works.
Jesus said come unto me all ye that labor and I will give you rest.
The rest that he gives to those that believe in him is permanent.
It does not belong to one day--the Sabbath--it is every day; every minute, as we rest in Christ. He is our rest.
I'm not saying the kingdom is consummated fully. But as more convert to Jesus as Lord, the kingdom grows. The kingdom is both present now and yet more to come in the future. And since the entire dynamic changed w/ the resurrection of Jesus... in other words the resurrection once believed to take place all at once is happening in stages (1 Cor. 15:23ff.)... we have an overlap of the ages. The present, evil age continues on w/ the age to come or the aeon of life ("eternal life") begun w/ Jesus' resurrection.
It doesn't have to be fully realized for it to begin. The resurrection was the beginning of new creation. At one time, it was believed to happen all at the same time. But Jesus' resurrection blew that out of the water. God is reigning here, but his rule is yet to be fully consummated. Jesus did usher in new creation, but only in an incipient form. There is more to come. Yet the present, evil age continues until he returns.