I didn't know about the Judas/Jesus story. Is that in the Koran?
I think so, but I say that with great trepedation.
I read the koran (English version I got free when stationed in Saudi) back in my "searching" days one time, very quickly.
It pretty much was a blur of "I call this B.S."
I just recall it being very intellectually inconsistent, and inconsistent with God's nature: He practically beats us over the head with Himself and what He wants; keeps NO secrets.
In contrast, the Old Testament/New Testament fit together like a glove to me (especially the Book of Matthew, which is the book for knowledgeable Jews to read, if they care to learn about Christianity).