We know that all three religions have a basic connection through Abraham. A succinct summary in The Complete Bible Handbook (see sidebar under Bible Study) shows where they agree and disagree about Abraham's example for us.
A common reverence for Abraham as a model of true human response to God and as ancestor of subsequent believers is one of the prime links between Jews, Christians, and Muslims.
Abraham's responsiveness to God is summed up in his epithet as "the friend of God." This title is first given in Hebrew scripture (Isa 41:8; 2 Chr. 20:7); it is taken up in the New Testament (Jas. 2:23); and in Islam, Abraham (Ibrahim) is known simply as "the friend" (Al Kahlil).
Each religion gives content to Abraham's friendship with God in terms of its own characteristic emphases, on the supposition that Abraham is best understood in terms of that to which he helped give rise. Thus for Jews (appealing to Gen. 26:5 as well as to more general considerations), Abraham is an example of one who was obedient to God's commandments, or Torah, even before Torah was given to Israel at Sinai. For Christians, following Paul's exposition (Rom. 4), Abraham is a model of one who has faith (pistis) in God. For Muslims, Abraham demonstrates islam, unconditional submission to the will of God, as in his willingness to sacrifice his son. Though Jews, Christians, and Muslims differ about the true human response to God as exemplified by Abraham, they agree that he provides a model of how human life should be lived.