There's no question that many Muslims are coming to know Jesus Christ, as Lord & Savior, of their lives. Indeed we need to pray for those who witness to the Muslim people all over God's world. Muslims claim to be blessed in Abraham and indeed they are blessed, in Ishmael, but they are not blessed through Abraham's son Isaac, which is the son of promise by Almighty God! Paul's words, in the book of Galatians, clearly states this. I have listed many verses, of God's Word -The Bible showing proof that NONE are children of Abraham unless they believe in God's Son, Jesus Christ!
Galatians 2:16
Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
Galatians 3:6
Even as Abraham believed God, and it was accounted to him for righteousness.
Galatians 3:7
Know ye therefore that they which are of faith, the same are the children of Abraham.
Galatians 3:9
So then they which be of faith are blessed with faithful Abraham.
Galatians 3:13
Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed [is] every one that hangeth on a tree:
Galatians 3:14
That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
Galatians 3:16.
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Galatians 3:28
There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
Galatians 3:29
And if ye [be] Christ's, then are ye Abraham's seed, and heirs according to the promise.