It all goes back to Abraham and Sarah. Abraham had an illegitimate son - Ishmael with their maid Hagar. Isaac was the son of Abraham and Sarah. It was stated that Ishmael and Isaac with father nations however MORE blessings were bestowed on Isaac. So it is the Christian and Jews against the Muslims who see Ishmael as the legitimate heir. It IS a holy war.
Appropriate excerpts to validate this statement:
Gen.17:19-21
[19] And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
[21] But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
Gen.21:9-13, 17-18
[9] And Sarah saw the son of Hagar the Egyptian, which she had born unto Abraham, mocking.
[10] Wherefore she said unto Abraham, Cast out this bondwoman (Hagar) and her son (Ishamel): for the son of this bondwoman shall NOT be heir with my son, even with Isaac.
[11] And the thing was very grievous in Abraham's sight because of his son.
[12] And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall THY seed be called.
[13] And also of the son of the bondwoman will I make a nation, because he is thy seed.
[17] And God heard the voice of the lad; and the angel of God called Hagar out of heaven, and said unto her, What aileth thee, Hagar? fear not; for God hath heard the voice of the lad where he is.
[18] Arise, lift up the lad, and hold him in thine hand; for I will make him a great nation.
So two nations are created however Isaac is the legitimate son.
This gets back to the homonucleus theory of reproduction current in those days. Whenever you see that word "seed", that's what it's about.
OK, so are Muslims Arabs? Cuz that's who came from Ishmael; the Jews came from Isaac. What exactly is Muslim?