What are the differences between muslims and jews?

We see the difference come from the book of Genesis. God promised Abraham that is wife Sarah would bear him a male child who would be heir to his household. Instead of trusting God, Abraham thought he was too old to have a child, so he had a child with Sarah's handmaid, Hagar, who bore the son Ishmael. However, in the next year Sarah conceived and bore a son Isaac who was the true heir of Abraham's house. So Muslims are the descendants of Ishmael, who is the bastard son of Abraham, whereas Jews, are descendants of Isaac, the true son of promise.