When we lived in the KSA my one of my husband's jobs was to hire Saudi companies to do work for ARAMCO. Bribery was a VERY strong possibility there so the company decided that the ONLY "gift" an ARAMCO employee could receive from a potential Saudi company was a Koran.
So he got a Koran. I still have it on the bookshelf.
THAT's how I know that it's a knock-off of our Bible. It's VERY evident. Same stories, same truths, same laws of God. Nothing new or different.
I’ve read the Koran, and there is absolutely no commonality between it and the Old Testament. There is some stuff “ripped off” from parts of the Talmud, but it’s heavily distorted and mixed with Arab mysticism. There is exactly one Bible verse quoted in its pages, but it doesn’t immediately come to mind.
There are not the “same laws of God” in the Koran’s pages whatsoever. Nowhere in the Bible does it say you can marry four wives and divorce them twice, for example; nor does it give sanction to have sex with all the slaves “that your right hand possesses”.
The Koranic Jesus is a completely different character, to boot. Not only is it denied that he is the Son of God in several verses (one of them having Jesus personally deny this), but it also denies that the crucifixion happened, saying that Allah “made it appear” that Jesus was crucified only. There are also Koranic verses that specifically attack the Trinity, decrying the notion that “Allah is one of three” and claiming that Christians said “take (Jesus) and (his) mother as gods beside Allah” et al.