The NT does not condemn the OT as being "corrupted". In fact, much of the OT is used to show how prophesy predicted Jesus coming. One such example is Daniel 9:24-27 which is basically a calendar for the coming of the Messiah from when Daniel wrote it. Guess what, it is spot on.The Quran is largely a mockery of the Bible, as Ishmael mocked Isaac.
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What are the seventy sevens in Daniel 9:24-27? | GotQuestions.org
What are the seventy sevens in Daniel 9:24-27? Do the seventy sevens represent 490 years in God’s program?
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Conversely, Mohammad "fixed" much of what is in the Bible himself, basically rewriting it.
For example, Mohammad insisted that Jesus did not really die on the cross. He said that God put some other poor soul there to die in his place
Bizarre.