The true sons of Abraham are not identified biologically, but Christologically.

In the words of the Puritan William Perkins, "The promises made to Abraham are first made to Christ, and then in Christ to all that believe in him."6

For where grace is, there is a remitting, and where remitting is, there is no punishment. Punishment then being removed, and righteousness succeeding from faith, there is no obstacle to our becoming heirs of the promise.

It is a great thing to be a child of God, and joint-heir with Jesus Christ. If this is your privilege, you will know the fellowship of Christ's sufferings.

Even the poorest in Israel are looked upon as freemen who have lost their possessions, for they are the sons of Abraham, Isaac, and Jacob.

Islam undoubtedly deserves respect. It has some things in common with Christianity, such as Abraham as a common progenitor, and the belief in only one God.

There can be no doubt that the blessing, of which believers are heirs, is justification by faith; and that the promise, according to which they are heirs of this blessing, is the gospel promise made to Abraham.

Learn to make peace with the mysteries of surrender, submission, endurance. The promise is based on God's grace. The promise comes by faith. All of Abraham's children will certainly receive the promise. And it is not only for those who are ruled by the law. Those who have the same faith that Abraham had are also included. He is the father of us all. —Romans 4:16 NIrV

Whatever belonged to you once, will always belong to you.

Thy name shall be Abraham; for a father of many nations have I made thee.

Heirs of God, and joint-heirs with Christ.

A deep spiritual bond exists between Christians, Moslems and Jews, for as Pope Pius XII said, all Christians are "spiritual Semites" because we are descended spiritually from Abraham.