Most Arabs are Muslims.
Muslims believe that they are the special hier NOT Isaac. Both were promised to have nations however Isaac has the special blessing.
Perhaps this website can better explain this:
http://www.answering-islam.org/BibleCom/gen16-3.html
Linkage Between Ishmael and Islam Today?
Ishmael's hostility and propensity to violence were rooted in the sin of his own scoffing and jealous attitude towards his brother Isaac. Muslims today are those in whom this vicious cycle has not been broken. They have voluntarily chosen to identify with Ishmael and have, consciously or unconsciously, embraced the spirit of that ancient and bitter rivalry. The present-day animosity of Islam towards Jews and Christians, in this author's opinion, can be traced to the Islamic embrace of the spirit of Ishmael. Hunter's analysis fits Islam today, and, we might add, all the rest of mankind who have not experienced the forgiveness of their sins in Jesus Christ.
http://injil.org/Books/FamOfAbraham.html#CHAPTER%205
more:
The Wild Donkey Prophecy
Let us look again at that verse about Ishmael's characteristics: "He will be a wild donkey of a man . . ." (Gen. 16:12). "A wild donkey of a man." What does it mean? God, in His withering rebuke to Job, spoke of the wild donkey:
Who let the wild donkey go free? Who untied his ropes? I gave him the wasteland as his home, and the salt flats as his habitat. He laughs at the commotion in the town; he does not hear a driver's shout. He ranges the hills for his pasture and searches for any green thing (Job 39:5-8).
Ishmael was to be strong, wild and free; and we might add, he also would be difficult, holding his brothers in contempt, despising town life, loving his freedom to the point of not being able to get along with his own kin or anyone else. As one commentary puts it: "The Ishmaelites live in an incessant state of feud . . . with one another or with their neighbours" and in the same passage quoted above, "Ishmael would maintain an independent standing before [in the presence of] all the descendants of Abraham" (Keil and Delitzsch, Reprint, 1954, 1:220). In the light of these characteristics, Muhammad was a true descendant of Ishmael. While trying desperately to tie into the genealogical tree of Biblical prophets, he fiercely maintained his independence as an "Arab prophet" with an "Arabic Quran" (Q. 12:1; 20:113; 46:12).
Just browse through the site for more information.
Bottom line is this, they too see a "prophet" coming soon just as the Christians and Jews do, however this Profit is Christ. So both sides are preparing to dominate. Of course Christ will win because their "prophet" is not the Messiah.
OK, so the problem IS Muslim, NOT Islam. Correct?