I understand what you're saying, BAC. There are so many views involving this, and I'm certainly not saying my view is the absolute truth. Taht would be foolish on my part.
The way I see it, the remnant is the 1/3 of the Israel left at the Second Coming that the prophet Zechariah told us about. All of this remnant will be saved according to Paul.
Zech. 13:8-9
"And it shall come to pass, that in all the land, saith the Lord, two parts therein shall be cut off and die; but the third shall be left therein.
And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The Lord is my God."
Then Zechariah continues in 14:1 to tell us how this happens.
Behold, the day of the Lord cometh, and thy spoil shall be divided in the midst of thee.
For I will gather all nations against Jerusalem to battle; and the city shall be taken, and the houses rifled, and the women ravished; and half of the city shall go forth into captivity, and the residue of the people shall not be cut off from the city."
Zechariah goes further to tell us that when Israel actually see's Christ save them from the anti-christ, and then realizing it is Jesus "of Nazareth, we are told there will be great weeping in the land (Israel) as one weeps for their firstborn.
This is when ALL of Israel (the one third left) is saved when they see for their own eyes who the Messiah really is.
I couldn't remember the rest of the Scripture in Zechariah, so I had to look it up.
Israel will be saved from the total defeat of the anti-christ by Christ Himself at the Second Coming. Israel will see Him do it, as Zechariah said. "and they shall look upon ME, whom they have pierced, and shall mourn for Him..."
Zech. 12:8-14
"In that day shall the Lord defend the inhabitants of Jerusalem; and he that is feeble among them at that day shall be as David; and the house of David shall be as God, as the angel of the Lord before them.
And it shall come to pass in that day, that I will seek to destroy all the nations that come against Jerusalem.
And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.
In that day shall there be a great mourning in Jerusalem, as the mourning of Hadadrimmon in the valley of Megiddon.
And the land shall mourn, every family apart; the family of the house of David apart, and their wives apart; the family of the house of Nathan apart, and their wives apart;
The family of the house of Levi apart, and their wives apart; the family of Shimei apart, and their wives apart;
All the families that remain, every family apart, and their wives apart.