You act as if Abraham, Isaac and Jacob and all the rest of the Old Testament saints weren't IN CHRIST. Why?
Christ was in the CHURCH in the wilderness. The children of Israel drank from the same spiritual drink that we drink from, that spiritual Rock that followed them: and that Rock was Christ.
God has chosen ONE group of people that he has set apart from the world and that group always has been and always will be those that are IN CHRIST. To say that God has chosen TWO peculiar nations is borderline heresy. I'm going to assume it's just ignorance and not a purposeful misleading of the people on your part.
While your post is on topic, it is sidestepping the issue I raised in response to your assertion. It is making unwarranted leaps of logic, assuming
my views on a matter that I have not addressed at all and making accusations that are quite thoroughly unnecessary. It's also arrogant.
God chose Israel to be His people from among all the nations (Deuteronomy 32:8-9). In essence, He created Israel from scratch. The verses below clearly associate the concept "God's chosen people" with ancient Israel, not a subset thereof:
Deuteronomy 7:6 For thou art an holy people unto the Lord thy God: the Lord thy God hath chosen thee to be a special people unto himself, above all people that are upon the face of the earth.
Deuteronomy 14:2 For thou art an holy people unto the Lord thy God, and the Lord hath chosen thee to be a peculiar people unto himself, above all the nations that are upon the earth.
1 Kings 3:8 And thy servant is in the midst of thy people which thou hast chosen, a great people, that cannot be numbered nor counted for multitude.
Psalm 33:12 Blessed is the nation whose God is the Lord; and the people whom he hath chosen for his own inheritance.
Psalm 105:43 And he brought forth his people with joy, and his chosen with gladness:
Isaiah 43:20 The beast of the field shall honour me, the dragons and the owls: because I give waters in the wilderness, and rivers in the desert, to give drink to my people, my chosen.
Daniel 11:15 So the king of the north shall come, and cast up a mount, and take the most fenced cities: and the arms of the south shall not withstand, neither his chosen people, neither shall there be any strength to withstand.