Firstly, Christianity is basically Judaism plus. It is built on Judaism with Jesus fulfilling the messianic prophecy, so that is how those 2 are related.
Abraham’s wife was up in age and didn’t have any children yet, so Abraham had a son (Ishmael) with a servant but then Abraham’s wife had a child (Isaac).
Ishmael is promised to found a great nation, (Muslims), while Isaac inherits God’s promises to Abraham, the promised land (Israel),
the promise of the descendants, and
the promise of blessing and redemption.
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