Jesus' prophecy in the Olivette Discourse shows us that the gentile church is not included in the gatherings when Jesus comes in glory.
Matthew 24:29-31 KJV
29) Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30) And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31) And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Ezekiel 39:25-29 KJV
25) Therefore thus saith the Lord GOD; Now will I bring again the captivity of Jacob, and have mercy upon the whole house of Israel, and will be jealous for my holy name;
26) After that they have borne their shame, and all their trespasses whereby they have trespassed against me, when they dwelt safely in their land, and none made them afraid.
27) When I have brought them again from the people, and gathered them out of their enemies' lands, and am sanctified in them in the sight of many nations;
28) Then shall they know that I am the LORD their God, which caused them to be led into captivity among the heathen: but I have gathered them unto their own land, and have left none of them any more there.
29) Neither will I hide my face any more from them: for I have poured out my spirit upon the house of Israel, saith the Lord GOD.
There are more like this, where God promises to bring His chosen nation of Israel back into their promised land.
Matthew 25:31-32 KJV
31) When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
32) And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
Joel 3:1-3 KJV
1) For, behold, in those days, and in that time, when I shall bring again the captivity of Judah and Jerusalem,
2) I will also gather all nations, and will bring them down into the valley of Jehoshaphat, and will plead with them there for my people and for my heritage Israel, whom they have scattered among the nations, and parted my land.
3) And they have cast lots for my people; and have given a boy for an harlot, and sold a girl for wine, that they might drink.
Matthew 25:35 KJV
35) For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in:
Matthew 25:42 KJV
42) For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink:
The nations are judged according to whether or not they provided for the needs of Jesus' brothers. Those who are rejected, are rejected not because they had not trusted in Jesus, but because they didn't do these works.
Some are judged righteous not because they've trusted in Jesus, but because they did do these works.
The works in particular were, again, to provide for the needs of Jesus' brothers. If a group of people are being separated according to how they treated certain ones, those one of necessity are not included in the group being separated.
All the marble that match the color of my marbles will be moved to this circle, and those that don't match my marbles are moved to that circle. So you see you have to be able to identify the color of my marbles before being able to divide the others, therefore, my marbles are known already.
In the same way, Jesus' brothers, the Jews, having been regathered, become the litmus test for the rest. Did you or didn't you give them what they needed? Why would this be important?
Revelation 12:13-17 KJV
13) And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child.
14) And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent.
15) And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away of the flood.
16) And the earth helped the woman, and the earth opened her mouth, and swallowed up the flood which the dragon cast out of his mouth.
17) And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Much love!