Genesis 35:11 “And God said unto him, I am God Almighty: be fruitful and multiply; a nation and a company of nations shall be of thee, and kings shall come out of thy loins”.
This is one of the verses people try to spiritualize by saying it means that other existing nations would become Jacob’s seed. This is not taught any where in scripture. How plain does it need to be when the text says “out of thy loins”? Let the scripture speak.
The word Company in “company of nations” comes from a Hebrew word that narrows it down to a select group of nations. Since God promised that Israel would become many nations we know those company of nations are made up of true physical Israelites.
There is never one time in all of the new and old testaments, that is the Greek and Hebrew texts, that God speaks of His people as all men from all nations in the entire world everywhere. It is not there.
The modern day Jews are not Biblical Israelites.