Who is Abul Cassim?

I know of very few educated people not familiar with the Name of Jesus Christ but I know of no people of my acqaintance or any learned ones who have ever heard of this person by this name.
The Qur'an insists in Sura (named Mary) 19:19 that ISLAM has been given a specific SIGN (called the GREAT SIGN in Islam that, if anyone denies it, is eternally condemned to the Great Fires of Hell) that is equally described in Sura 74:30 as HE who is ABOVE it all as 19 and whom Muhammad insisted will ,one day,Judge ALL of mankind.
In the Sepher yetsira we read of the Double CUBE Mystery and here we have the SIGn thereof in the Double 19 of S19:19 for which kingdoms were sold to KNOW this Secret Over it all as 19 who is God in Phil 2:9 if you know 2368 added to be 19 as ONE.
The GREAT SIGN of the Qur'an is in S19:19 for a reason so check out www.19.org or www.submission.org to KNOW that what is given is TRUE where it says in verse 19, the "GIFT unto all of mankind, this HOLY SON . (man cannot have a holy son) who is 19 and the Qur'an would not bother with 19 if not HOLY as 2368 as Jesus Christ.Verse 21 says that ALLAH says: "It is easy for ME (singular) and WE (plural in the Godhead or Trinity of Genesis 3) to appoint HIM (Jesus Christ) as a SIGN unto all mankind and a Mercy from US "plural as ONE) Jesus is the SIGN to all mankind and not Abul Cassim today known as the Praised One and Matt 23 tells us to PRAISE no man as a SIGN except it be GOD as the SIGN to mankind and not man.