The Qu'ran teachs the Injeel is the true word of God. Do Muslims know what the good news is?

No Muslims believe that it is corrupt and not the Injeel that the Qu'ran calls holy. They can't agree on when it was corrupted or how it is corrupt except that it is not in agreement with the Qu'ran therefore must be corrupt even though the Qu'ran calls it holy. Seems anything that disagrees with the Qu'ran can't be holy therefore they have chosen the teachings of Muhammad over the true word of God.