The word of God should be 100% correct; it should not contradict scientific facts. We Muslims believe that the Holy Book was a divine book but later men changed in it; so many interpolations that had never been in the bible, so many deletions and modifications also can be detected so easily.

The bible was passed from a generation to a generation orally, so many mistakes were committed and many additions from ancient cultures were inserted in the Holy Book. However most of the biblical modifications were made with malicious intents. 'How can you say, "We are wise, for we have the law of the LORD," when actually the lying pen of the scribes has handled it falsely? Jeremiah 8:8 The Holy Quran, God's last book to humanity is the sole book that was written the moment it was revealed. So you can't find a single mistake in it, you can't find irregularities, irrationalities, contradictions, absurdities, unnecessary details or any illogic statements. The rainbow in the Story of Noah

"After the flood, Noah offered a sacrifice to God, who promised never again to destroy all life on earth with a flood [Genesis 9:11] and created the rainbow as a sign of His promised [Genesis 9:13].

After this, Noah became a farmer, and he planted a vineyard: and he drank wine, and drunk, and was found in his tent.

 Children of Noah: Ham, father of Canaan, saw the nakedness of his father and told his brothers and Noah cursed Ham's son: Canaan [Genesis 9:20-27].

Sentences above seem odd, because it seemed to put a rainbow (which is described as a bow) newly created after the Genesis Flood of Noah, while the rainbow caused by the refraction of sunlight by rain or dew point.
                                                                                                                
  
All colors are produced by rainbow originated from sunlight. It did rain, moisture, and sunlight; newly formed after the Flood of Noah? The answer is clear: "NO". So what Genesis says that contrary to scientific reasoning It is scientifically well established that a rainbow is nothing but a result of the sunlight after falling on the hanging particles of water and dew Rainbows are made when light is refracted through millions of droplets in the air. White light is made up of red, orange, yellow, green, blue and violet light, so when it is split into components by the water droplets, it is seen as a rainbow. Rainbows usually occur when the moisture in the air, such as after a rainstorm, when the sun is out. Here is the writer of Genesis inserted in it what really hadn't been in it, the change of the word of God always makes it shaky and makes the entire book skeptical. However, the Holy Quran, the Muslim Holy Book, doesn't contain such nonsense, when it talks about natural phenomenon it will always be 100% correct.