If Allah has confirmed the Torah and according to the Torah Isaac is the son of the promise not Ishmael and it is through Isaac not Ishmael that God will fulfill His purpose for mankind then Muhammad is nothing more than a footnote in history and not a prophet of God.003:047* She said: My Lord! How can I have a child when no mortal hath touched me? He said: So (it will be). Allah createth what He will. If He decreeth a thing, He saith unto it only: Be! and it is.
003:048* And He will teach him the Scripture and wisdom, and the Torah and the Gospel,
003:049* And will make him a messenger unto the Children of Israel, (saying): Lo! I come unto you with a sign from your Lord. Lo! I fashion for you out of clay the likeness of a bird, and I breathe into it and it is a bird, by Allah's leave. I heal him who was born blind, and the leper, and I raise the dead, by Allah's leave. And I announce unto you what ye eat and what ye store up in your houses. Lo! herein verily is a portent for you, if ye are to be believers.
003:050* And (I come) confirming that which was before me of the Torah, and to make lawful some of that which was forbidden unto you. I come unto you with a sign from your Lord, so keep your duty to Allah and obey me.
003:051* Lo! Allah is my Lord and your Lord, so worship Him. That is a straight path.
http://quranbrowser.com/cgi/bin/get.cgi ... =003:47-51
And what is the Gospel? The Gospel is believe on the Lord Jesus Christ and you shall be saved. Jesus said:
John 14:5-7
6 Jesus said to him, "I am the way, and the truth, and the life; no one comes to the Father, but through Me. 7 "If you had known Me, you would have known My Father also; from now on you know Him, and have seen Him." NAS