The Lord talking to Hagar;
Genesis Chapter 16 verses 11 & 12. Verse 11. And the angel of the Lord said unto her, Behold, thou art with child, and shalt bear a son, and shalt call his name ISHMAEL; because the Lord hath heard thy affliction.
Verse 12. AND HE WILL BE A WILD MAN; HIS HAND WILL BE AGAINST EVERY MAN, AND EVERY MAN'S HAND AGAINST HIM; AND HE SHALL WELL IN THE PRESENCE OF ALL HIS BRETHREN.
Ah yes, a very fitting description of Islam AND Ishmael, is it not?
Genesis Chapter 17 verse 21. But MY COVENANT (GOD'S) will I establish with ISAAC, which Sarah shall bear unto thee at this set time IN THE NEXT YEAR.
In this same Chapter moving down to verse 25, you will find Ishmael being circumcised at about the same time God spoke to Abraham and Ishmael is aged at 13 years of age. Your off there TM7.
In Genesis Chapter 17, verse 18 Abraham tried to push Ishmael to the forefront, but God REJECTED the marriage AND the son born of it, as He (God) did not recognize the marriage as legitimate, nor the son (Ishmael).
In the same Chapter and NEXT VERSE (Verse 19), God RECOGNIZED the UNBORN ISAAC, which would be born of the only wife God recognized Abraham to have.
Scripture could not be plainer.
But then you would also need to go on to Genesis Chapter 29 verse 9, where Ishmael MOCKED his rival Isaac. Then to verse 13, explains WHY God blessed Ishmael, but not because he was a good kid. He wasn't. And then verse 14, where both he AND his mother were banished for Abraham's household.
There WAS NO relationship between he and his father Abraham after that, much less them travelling to Mecca or anywhere else together. Ishmael was an OUTCAST.
In Genesis Chapter 25 verse 9, Ishmael returned to help bury his father.
On a final note, your statement of the Muslim considering Christ as the Messiah, is absurdly blasphemous. It is common knowledge that Christ to the Muslim is a LESSOR PROPHET to Mo hammed.
You not only need to STUDY the Bible BEFORE you start quoting scripture, you need to also STUDY Islam. Your attempt at doing both shows your lack of knowledge concerning both. Your attempt at combining the two, flies in the face of God Himself. No self respecting Christian, with any knowledge of scripture at all would accept such garbage.
What folks like you REALLY NEED TO DO, is to move to a Muslim nation and live under Sharia Law for a while.