Could you show me and others, where in the Koranic text it explicitly and clearly states that the Christians deliberately corrupted the text in the exact manner you describe.
Kai
[3:3,4] He (Alllah) sent down to you (Muhammad) the scripture with the truth as a truth verifier/authenticator (musadiq) for whatever is at hand with it, and He sent down the Torah and the Gospel from before as a guidance to the people and he sent down the distinguisher (furqaan)...
[5] and We sent down to you (Muhammad) the scripture with the truth as a truth verifier/authenticator (musadiq) for whatever is at hand with it from the scripture (of divine revelation), and as a supervisor over it (the former scripture); So then judge between them (the Jews and Christians) with what Allah sent down (to you Muhammad), and do not follow their arbitraries away from what came to you(Muhammad) from the truth....
Whatever in the Bible or
any religious scripture from among any religion in the world that contradicts the Quran then that thing is not the truth revealed by Allah (G-D). There for it is not the word of Allah.