Addendum: So how would the Sunni and Shi'a Islam unite as foretold in the Psalm 83 prophecy when at present they are so involved in unrelenting blood lust and wanton murder of each other, particularly in Syria and Lebanon of late? The answer is to be seen in their recent history. In Iraq Sunni and Shi'a united in alliance extremely rapidly against US and Coalition forces. They've done the same in Afghanistan. They did so also against Qadaffy in Libya previously. When these two sects of Islam are not killing all those they see as infidels they will kill each other with relish. It is as primitive and tribal of an affair today as it has been since 632 AD.
And this was specifically foretold by the angel of the Lord to Hagar concerning Ishmael and his descenants in Genesis 16:10-12
Then the Angel of the Lord said to her, “I will multiply your descendants exceedingly, so that they shall not be counted for multitude.” And the Angel of the Lord said to her:
“Behold, you are with child,
And you shall bear a son.
You shall call his name Ishmael,
Because the Lord has heard your affliction.
Then in Genesis 25:12-18 the names the individual descendant tribes that Ishmael was the father of are listed and where they would dwell is also accounted for. This is particularly of interest to us with respect to the Psalm 83 prophecy, that is, to east of Egypt and northward to Assyria. This defines the geographic area of the nations named that are around Israel. And I believe we need look no further than some currently unforeseen event that results in the fulfillment of Isaiah 17 as the catalyst to unite Islam and propel it to its fate as described in the Psalm 83 prophecy.He shall be a wild-ass man;
His hand shall be against every man,
And every man’s hand against him.And he shall dwell in the presence of all his brethren.”