The Real History of God's Israel:
The origin of the title 'Israel' was the new name God gave to Jacob. Even before Jacob was born, while he and his brother Esau were in their mother's womb, there was a stir in her womb, which she prayed about. God said there were two manner of people in her womb, and that the younger (Jacob) would rule over the elder (Esau). Jacob was thus chosen by God, before he was born (see Gen.25).
Per Gen.32, Jacob wrestled with the Angel that prevented him from entering into the promised land, and would not let him go until the Angel blessed him. Jacob was then given a new name, Israel, to represent his having overcome with God's help.
But many fail to recognize that Jacob was still later called Jacob in Scripture, showing the new name Israel was especially symbolic. It represented God's Birthright promises He first gave to Abraham, which were later passed on to his son Isaac, and then to his son Jacob. Thus God is called The God of Abraham, and The God of Isaac, and The God of Jacob, to represent the inheritance Birthright that God first gave to Abraham. Included in that Birthright blessing was The Gospel of Jesus Christ, the most important part. It also included plenty of corn and wine (i.e., great resources), ruling the gates of one's enemies (greatest military power), and a seed as many as the stars and sands of the sea, a throne with kings, and giver of God's laws.
This Birthright from God given through Isaac is something that still irritates the seed of Ishmael (Arabs) to this day, as their clerics admit. They see Ishamel as the real firstborn son of Abraham, which still God had promised that in Isaac would be counted for the seed, because He promised that Sarah would bear. Sarah being old, thought God needed a little help, so she sent her servant Hagar into her husband Abraham's tent, and Ishmael was born. But Hagar and Ishmael were later cast out by Abraham because of Sarah's jealousy. Nevertheless, God promised the seed would be through Abraham and Sarah, not Hagar.
Then Jacob had 12 sons, which would later become the 12 tribes of Israel. The Birthright then went to the firstborn Reuben, but he defiled his father Jacob's bed by having sexual intercourse with one of Jacob's wives. The Birthright then defaulted to Jacob's son Joseph who was separated into Egypt, where Joseph had two sons, Ephraim and Manasseh:
1 Chron 5:1-2
5:1 Now the sons of Reuben the firstborn of Israel, (for he was the firstborn; but, forasmuch as he defiled his father's bed, his birthright was given unto the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birthright.
2 For Judah prevailed above his brethren, and of him came the chief ruler; but the birthright was Joseph's:)
KJV
God's Birthright promises, which included the king line over Israel, was split. The king line and care of the law was given to the tribe of Judah (here and Gen.49:10). But the rest of the Birthright promises were given to Joseph and his then his two sons Ephraim and Manasseh.
In Genesis 48, Ephraim's seed was promised to become a "multitude of nations". And his brother Manasseh was also to become "great". This is where God's Birthright stopped. It is still with these two to this day. How did this happen and manifest?
It manifested through Christ's Church.
God split old Israel into two separate kingdoms first, during the time of Solomon's son Rehoboam (1 Kings 11). The 2 tribed southern "kingdom of Judah" reigned over the southern lands in the Middle East, and the 10 tribed "kingdom of Israel" reigned over the northern lands. God setup one of the seed of Ephraim as king of Israel over the ten tribes in the northern lands. The two kingdoms had war against each other. Because Jeroboam, king of northern Israel setup golden calf idol worship in the north, God removed the ten northern tribes captive to Assyria and the land of the Medes, and regions around today's Turkey. There the ten tribes fell fully into their Baal worship they coveted, and lost their heritage as part of Israel. This was outlayed in the Old Testament prophet Hosea. In Jesus' day, the ten tribes were gone, not in the holy lands at all.
God promised He would punish Israel if they turned away from Him by scattering them among the Gentiles. This He did to the ten tribes. They became lost. Per Hosea, God said He wouldn't do this to Judah (Jews), so they kept their heritage as part of Israel.
When our Lord Jesus came to Jerusalem to offer the Jews in Judea His kingdom, they instead crucified Him. Then The Gospel went to the Gentiles, where the ten tribes had been scattered among. Scattered Israelites along with Gentiles, both believers on Christ Jesus as their Saviour, then became Christ's Church, with God's Promises of His Birthright passed to them, except the royal rule and giver of the law would remain with the tribe of Judah, even as it still is to this day.
This is how God's promise through Jacob to his sons Ephraim and Manasseh would be fulfilled, with the "multitude of nations", and "company of nations" prophecy (Gen.35; Gen.48). God does what He says. We can count on it. This has not just been spiritually fulfilled. It has also been literally fulfilled. The reason why Christ's enemies hate the European monarchs so much is because Satan knows where God moved His Promises to. God ended David's throne in Jerusalem in the days of Jeremiah the prophet. To this day since then, there has never been one of the house of David sitting on a throne in Jerusalem. Yet that was one of God's Promises per His Birthright to Judah. No worry, He fulfilled it elsewhere, through Christ Jesus. This is one of the biggest factors of today's Jerusalem and state of Israel not yet being the result of God's return of the kingdom. There still is no king of the house of David sitting on a throne there in Jerusalem.
So don't be deceived brethren about today's nation of Israel in the Middle East. The majority of God's promised Birthright is still not there yet, and won't be until Jesus returns. As the end in our day approaches, the orthodox unbelieving Jews will continue to try and make us think God's Kingdom has come there today. There indeed still are blessings He gives them there, but they still are not the majority of His promises He gave to His Israel which make up Christ's Church today.