@Dave M
It seems like many things in Christianity there are two extremes at opposite ends of a spectrum I think going too far
in either direction can sometimes be a bad thing.
I believe as it seems you do. The kingdom of heaven is both spiritual and physical. Although we are physical fleshly
beings, a part of us is spirit and lives in the "spiritual realm" of heaven.
There is a teaching that says our spirit has always existed, but the Bible says the physical comes first.
1 Cor 15:40; There are also heavenly bodies and earthly bodies, but the glory of the heavenly is one, and the glory of the earthly is another.
1 Cor 15:41; There is one glory of the sun, and another glory of the moon, and another glory of the stars; for star differs from star in glory.
1 Cor 15:42; So also is the resurrection of the dead. It is sown a perishable body, it is raised an imperishable body;
1 Cor 15:43; it is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in power;
1 Cor 15:44; it is sown a natural body, it is raised a spiritual body. If there is a natural body, there is also a spiritual body.
1 Cor 15:45; So also it is written, "The first MAN, Adam, BECAME A LIVING SOUL." The last Adam became a life-giving spirit.
1 Cor 15:46; However,
the spiritual is not first,
but the natural;
then the spiritual.
1 Cor 15:47; The first man is from the earth, earthy; the second man is from heaven.
We aren't spiritual beings that become flesh, we are flesh beings that have a spirit. The flesh always comes first with men (humans).
With Jesus it was the opposite. He always existed as part of the triune God, but didn't always exist in flesh. He became flesh to dwell
among us. ( John 1:14; )
We could say the kingdom of heaven exists on the earth right now. But that isn't entirely correct.
It exists in some places. Now God is omniscient and exists everywhere, I'm not saying anything different. But He know which
people on the earth belong to Him, and which people choose not to. The vast majority choose not to.
So the kingdom of heaven exists in little camps here and there. Sometimes the camps are quite large, but sometimes there is
only person in the camp. It also exists physically. You and I are part of the kingdom. Perhaps some church buildings might be
considered part of the kingdom. But we certainly can't say it exists physically all over the world currently.
Some believe this "spiritual kingdom" is all there is, and all there ever will be. Some go so far as to say all the events in Revelation have
already happened, Jesus has already came back and set up His kingdom here on the earth. Of course there are many many problems
with this doctrine, but it exists nontheless.
Technically it isn't Jesus dwelling among us right now. It is the Holy Spirit that dwells within us.
Second, the "god of this world", "the prince of the air" ( 2 Cor 4:4; Eph 2:2; ) is still roaming around seeking whom he may devour. ( 1 Pet 5:8; )
When Jesus comes back, everyone will see Him. He will come in power and Glory. He will rule over the entire earth with a rod of iron.
Not just pockets here and there, but everywhere. For the first 1,000 years Satan will be imprisoned. Neither of these things have ever happened
yet. Jesus has never ruled over the entire earth with a rod of iron, and Satan still hasn't been imprisoned.
The new Jerusalem has physical dimensions and will exist physically. Satan and those who follow him will eventually be cast into the
lake of fire. This hasn't happened yet either. The new Jerusalem is not a "spiritual only" kingdom that has already come down.
If we look at all the bowl, trumpet, peals of thunder etc... judgments of Revelation, they haven't happened yet.
The birth pangs Jesus talks about have started, but the events of the great tribulation haven't even begun yet.
The rapture hasn't happened yet (most people who believe in the "spiritual only" kingdom don't believe in the rapture). They would say the rapture can't happen and doesn't need to happen if the events of Revelation have already happened.
Yet despite all these things.. some people still believe it is already here.
I've noticed at least 3 or 4 that believe this way here on TJ. However it isn't really worth arguing over, I don't believe your salvation depends on which way you believe here. In way we believe the same thing, only the timing is different.