@Br. Bear
Many thanks for your post, interesting comments brother.
May I add comments for discussion also, there will be items in this topic that some may accept, some may not, but we are told to search the scriptures, the Truth is there for us, hidden treasure, which will make us 'Rejoice'.
I am considering here now three different items although are closely relates and closely interlinked.
Heaven (The Current Heaven), The Temple and the Church.
The Temple of God is as you kindly put in the Saved believer, Christ's Spirit within, each Saved believer is part of the One True Church worldwide, we are spiritual rocks with Christ as the corner stone, He is the Head of His Church.
Jesus is in Heaven, The Current Heaven, sat at the right hand of the Father. John gives us a fantastic picture as he enters heaven in the spirit. What he saw is of prime importance, although parts of Revelation is Apocalyptic, it isn't all so, Isaiah and Hebrews gives parallels to the picture in Heaven.
Heaven was on earth as we know, Adam and Eve was in Paradise, until they sinned and were banished from the garden, never to be able to re-enter due to sin and God's curse. God now lives in the highest heaven, scripture confirms this as the third heaven and Jesus is at His right hand.
Thank you for quoting the Lord's Prayer brother, but I read as follows.
Our Father which art in Heaven
Hallowed, Holy be His Name
Thy Kingdom COME, Thy will be done
On earth, as in Heaven
Thy Kingdom come, thy will be done, is in the Holy Temple within every Saved believer, whose name is in the Book of Life and the Lamb.
So a portion of the 'Current Heaven' is within saved believers, Thy Kingdom comes to us o earth from heaven, a taste of heaven, we are purchased by Christ to worship and do His work on earth until He, the bride Returns in Glory.
Your post was valid brother, it shows clear a portion of the 'Current Heaven' given to us, within us, so that together as The True Church it is continually built up, with Jesus as the Head, the Groom preparing to return to His precious, loving bride.
But the Current Heaven is still what scripture says is the third heaven. It is the place saved believers go when we die on earth, prior to Christ's first Return, the Rapture, what about those who are martyred in the Great Tribulation Period, after the Rapture, who have repented and accepted Christ before His second Coming in Glory.
After Christ's Return in Glory Heaven and Earth will be as we know restored, brought back together, made new. We will discuss that in another thread after this thread for the Current Heaven. It will be exciting I am sure, if we can rejoice now how much more we will rejoice then as we discuss our new home with our resurrected bodies with our Lord.
I have added some further considerations in my last post.
Bless you brother