They fight over who has the correct interpretation of the word of God, and who is the people blessed by God, and the true people of Abraham, for he is both their fathers, and Islam is against them like they would be any religion that does not acknowledge their belief of truth.
Act 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
Act 1:7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
Jer 46:27 But fear not thou, O my servant Jacob, and be not dismayed, O Israel: for, behold, I will save thee from afar off, and thy seed from the land of their captivity; and Jacob shall return, and be in rest and at ease, and none shall make him afraid.
Jer 46:28 Fear thou not, O Jacob my servant, saith the LORD: for I am with thee; for I will make a full end of all the nations whither I have driven thee: but I will not make a full end of thee, but correct thee in measure; yet will I not leave thee wholly unpunished.
And Israel will never go down because God said He is going to restore the kingdom to Israel, and make a full end of all nations governments but Israel shall not have an end but they will be punished in part for rejecting the truth, and after they have borne their shame then the kingdom shall be restored to them.
The Hebrews that follow the Old Testament are the only people that can fight physically on Earth and it is alright like in the Old Testament, but Christians and all other religions, and beliefs, cannot fight and it is alright.
If that is what it takes then God will fight on the side of Israel to make sure they never go down, and if Israel has to fight physically to make that happen they will overcome odds tremendously.
Isa 31:4 For thus hath the LORD spoken unto me, Like as the lion and the young lion roaring on his prey, when a multitude of shepherds is called forth against him, he will not be afraid of their voice, nor abase himself for the noise of them: so shall the LORD of hosts come down to fight for mount Zion, and for the hill thereof.
Isa 31:5 As birds flying, so will the LORD of hosts defend Jerusalem; defending also he will deliver it; and passing over he will preserve it.
The 6 day war where jet fighter pilots won the war beating Egypt, Jordan, and Syria, and took control of all of Jerusalem.
Israel’s stunning victory in the Six-Day War of 1967 left the Jewish nation in control of territory four times its previous size.
Egypt lost the 23,500-square-mile Sinai Peninsula and the Gaza Strip, Jordan lost the West Bank and East Jerusalem, and Syria lost the strategic Golan Heights.
Little ole' Israel when she was not operating very long after they became a nation again in 1948 did a feat like that in 1967.
They will never go down.
The whole world could attack Israel and try to defeat the Jews, and they would lose for God will never allow it to happen.
Some people think God is done with Israel focusing on the world, and Christianity, but He is not done with Israel, and never will be done with them.