Anyways, if you engage folks who hold the different theologies, you would likely find that Premillennial Dispensationalists are the most nasty, in terms of insults.
I can think of some examples on this forum, but it is not fair to generalize. I've known many polite premillennial dispensationalists. The polite one's posts probably do not stand out in your memory for their politeness as much since that is to be expected.
Did you coin the term 'Separation Theology'? That was confusing to me because Darby was a pretrib dispensationalist, and I believe he taught 'separation from evil', though that could have been later terminology for the concept. That's different from the label...I am assuming...you are putting on straightforward interpretation of texts about Israel in the Old Testament.
In fact, one premillennial dispensationalist on this forum told me I was accursed for my position on this issue. The accusation of this individual is the primary reason why I am starting this thread.
A curse or an accusation, or was it both?
Well, this isn't true. There is only one people of God, Jews and Gentiles together. God doesn't have a separate plan for Jews, and a separate plan for Gentiles.
What about plans for nations? The Old Testament teaches about God making kingdoms and nations fall? Do you think He stopped doing that at the cross or the ascension or is He still sovereign over the nations?
If we read Romans we see that Israel rejecting truth and the truth going out to Gentiles was predicted in the Old Testament. God is using Gentiles to provoke Israel to jealousy. "I will provoke them to jealousy by them that are no people, and by a foolish nation I will anger them"-- wrote Paul in Romans 10 quoting from the song of Moses. Right now, a remnant of the nation of Israel finds salvation through faith and the rest are blinded, as we see in Romans 11. Natural Israelites are 'natural branches' in the olive tree and Gentile converts to Christ are wild branches grafted in. The wild branches are not to boast that they were broken off that we might be grafted in, and there is a strong warning against that.
The blindness on Israel lasts until the fullness of the Gentiles be come in. Then all Israel shall be saved. Paul writes that through our mercy, they might obtain mercy.
God made many promises to the nation of Israel that are to be fulfilled. Part of the way of restoring them is by provoking them to jealousy through Gentile conversion, which also plays a role in the Old Testament prophecies about the Messiah inheriting the nations.
How is it possible to understand Romans without some sort of understanding of different categories of 'Jew' and 'Galatians.' The part about no Jew nor Greek, male nor female, slave nor free in Galatians is about our status as being heirs according to the promise. Women no longer have to be a part of a household whose head gets circumcised to be in covenant through promises made to Abraham. Nor do slaves. But that does not mean gay marriage is okay or that wives do not submit to their husbands. Paul told slaves to submit to their masters. So there are distinctions recognized between these groups in other passages aside from being heirs according to the promise. Paul later wrote to the Corinthians that if one is circumcised not to seek to be uncircumcised and if one is uncircumcised not to seek to become circumcised.
Peter also offered 'men of Israel' salvation through Jesus that the time of restoration of all things may come and that He might send Jesus back.
Consider Acts 15.
13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me:
14 Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name.
15 And to this agree the words of the prophets; as it is written,
16 After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up:
17 That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things.
18 Known unto God are all his works from the beginning of the world.
Here we see that God is taking from among the Gentiles a people for himself. Consider the situation. These men were Jews who had been circumcised and were seeking to obey the law of Moses, debating whether Gentiles who believed in Jesus had to do the same. Such Gentiles who were circumcised were considered to have become a part of the nation of Israel. But James concludes from scripture that God was taking from among the Gentiles a people for himself.
In the eschatological future, Amos prophesied about Gentiles on whom the Lord's name would be called. In the time of James, and our time, God is still taking from the Gentiles, from the nation, a people for himself.
This is one of many prophecies like it, but consider this:
Isaiah 43:5-6 King James Version (KJV)
5 Fear not: for I am with thee: I will bring thy seed from the east, and gather thee from the west;
6 I will say to the north, Give up; and to the south, Keep not back: bring my sons from far, and my daughters from the ends of the earth;
Would the audience have thought that the prophecy addressed to their people was really addressed to a group of mixed Jews and Gentiles, or those of ethnic descent whose ancestors were Jews but had not been circumcised for generations, and Gentiles? Would they have interpreted the land here to refer to some kind of allegory? Is there any evidence the apostles interpreted it this way?
After opening their minds to understand the scriptures, the apostles, in Acts 1, asked Jesus if He would at that time restore the kingdom to Israel. He did not rebuke them for not understanding. He said that it was not for them to know the times appointed by His Father.