I think it was because God promised Abraham that the messiah would come through his children with Sarah that Christianity focuses on that line, rather than the offspring of Ishmael. Interesting point on the sacrifice of his son, although I think the point of the sacrifice was for Abraham to trust God, rather than which son was more important (really, neither son was less important than the other in the eyes of Abraham, it was just that God happened to promise the Messiah would come from his offspring with Sarah. And this was to prove that even though it looked impossible, because Sarah was beyond childbearing age, God always fulfills his promises).
Chlo, as Hagar/Hajira was considered a second wife, does this mean there are circumstances where polygamy was acceptable in Islam? In the Old Testament, there were quite a few examples of men (who were followers of God) who had more than one wife. And does Islam differentiate between the title of concubine (which is what Hagar/Hajira was classified as) and that of wife?
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