Which is not the case. Romans 9:
God's Sovereign Choice
…17For the Scripture says to Pharaoh: “I raised you up for this very purpose, that I might display My power in you, and that My name might be proclaimed in all the earth.” 18
Therefore God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden. 19One of you will say to me, “Then why does God still find fault? For who can resist His will?”
The lost sheep? Are the house of Israel and Judah.
Jeremiah 50
But Jesus also said he has other sheep that he must bring also. John 10:16“And I have other sheep, which are not of this fold; I must bring them also, and they shall hear My voice; and they shall become one flock with one shepherd. [Romans 11:29 For the gifts and the calling of God are irrevocable. 2 Thessalonians 2:14 To this he called you through our gospel, so that you may obtain the glory of our Lord Jesus Christ. Ephesians 1:19, Romans 8:30, et all...]
This was a factor in the OT as well. Isaiah 49:1
A Remnant Chosen by Grace
Romans 11:1I ask then, did God reject His people? Certainly not! I am an Israelite myself, a descendant of Abraham, from the tribe of Benjamin.
2God did not reject His people, whom He foreknew. Do you not know what the Scripture says about Elijah, how he appealed to God against Israel:
3“Lord, they have killed Your prophets and torn down Your altars. I am the only one left, and they are seeking my life as well”
a?
4And what was the divine reply to him? “I have reserved for Myself seven thousand men who have not bowed the knee to Baal.”
b
5In the same way, at the present time there is a remnant chosen by grace.
6And if it is by grace, then it is no longer by works. Otherwise, grace would no longer be grace.
c
7What then? What Israel was seeking, it failed to obtain,
but the elect did. The others were hardened,
8as it is written:
“
God gave them a spirit of stupor,
eyes that could not see,
and ears that could not hear,
to this very day.”d
9And David says:
“May their table become a snare and a trap,
a stumbling block and a retribution to them.
10May their eyes be darkened so they cannot see,
and their backs be bent forever.”
e
The Ingrafting of the Gentiles
11I ask then, did they stumble so as to fall beyond recovery?
f Certainly not! However, because of their trespass, salvation has come to the Gentiles to make Israel jealous.
12But if their trespass means riches for the world, and their failure means riches for the Gentiles, how much greater riches will their fullness bring!
13I am speaking to you Gentiles. Inasmuch as I am the apostle to the Gentiles, I magnify my ministry
14in the hope that I may provoke my own people to jealousy and save some of them.
15For if their rejection is the reconciliation of the world, what will their acceptance be but life from the dead?
16If the first part of the dough is holy, so is the whole batch; if the root is holy, so are the branches.
17Now if some branches have been broken off, and you, a wild olive shoot, have been grafted in among the others to share in the nourishment of the olive root,
18do not boast over those branches. If you do, remember this:
You do not support the root, but the root supports you.