The Koran is two-faced in its discourse on the Taurat (Torah”) and the Injil (its term for the Gospel). It mixes praise for the “people of the book” with condemnation for, as is claimed, promulgating altered versions of the Torah and gospel, and thus presenting the Koran as the “final revelation” that replaces and allegedly restores all “corrupted” prior revelations. That’s the logjam that has to be broken through.
An excellent book on the subject is Captive in Iran, the story of two Iranian Christian women who were imprisoned around the time of Ahmadinajad's second election (the contested one with all the riots) for sharing the gospel in Iran, and their experiences of praying for their fellow prisoners, many of whom were muslim.
What is being presented is a “false teaching”, the Koran.