Hi,
I mentioned a verse of the Quran as well as a Hadith. Are Christians here convinced or do they have an answer?
Further, the Quran says:
"None of Our revelations do We abrogate or cause to be forgotten but We substitute something better or similar; knowest thou not that Allah hath power over all things?" (2:106)
So first the original Injeel was revealed which told the people the right way of life. But as the people began understanding more about what is right and what is wrong, the Quran was revealed which is the complete guide of life, and which is for all people and forever to be followed till the world ends.
Take care