Dr. David Wood calls that the “Islamic Dilemma”.
The Koran affirms the authority of the Bible as it was back then and as we have it now—and yet the Koran is antithetical to the Bible on just about every point of doctrine, so the Mahometan scholars and clerics have to claim that the very Bible that the Koran affirms has been “corrupted” without any evidence to back that up.
Therefore, if the Bible is true, then obviously the Koran is false—but if the Bible is false, then the Koran is also false.
Also, they can’t claim the Bible was corrupted later on because the only Bible we have in its final form was finalized at the Council of Nicaea, 350 years before the arrival of Islam.
Yes. And Islam's specific teaching on Jesus completely fatally discredits itself. They teach that Jesus was a human prophet and a good teacher, but nothing more. However, Jesus describes himself as The Messiah; stating, "I am the Way, the Truth, and the Life, and nobody comes to the Father except through Me." If Islam's take on Jesus is accurate, then Jesus is the absolute worse false prophet, but they declare Jesus as a good prophet. Like C.S. Lewis said, Jesus is either Lunatic, Liar, or Lord. Thus, Islam is a false religion.