I just don't understand why you keep runnig away from answering the questions about "your only son" and the meaning of "great nation". Also, if what you say is true then what is the meaning of an "overlasting convanent with Isaac" and where is the Gentiles here.
Here is the facts:
1) When GOD said your only son he meat Ishmael not Isaac and it is clear from the text and it is pretty obvious that the word Isaac was inserted instead of Ishmael. read Genesis 22-2
2) Ishmael will be a great Nation and I already talked about what great nation means.
3) The phrase "overlasting covenant" with Isaac exclude all the gentiles, because according to the Christyian traditiona new convenant was established with the gentiles through Jesus and the old one have been erased.
Before you answer my post, please read it first, scroll up and read. I see how people live in denial every day, and obviously it's pretty dominant here.