Couple things. First 'Christ' is just the Greek translation of 'Messiah.' The Old Testament has a lot of messianic predictions, no doubt, and Christianity split off from the broader group of messianic Judaism sects during the second temple period, all of which took the OT to predict a NEW messiah (anointed one, in the sense of a Davidic king annointed by God to redeem Israel).
The Old Testament also predicts false prophets, calling them sorcerors. And this is what the Jews who didn't believe in Jesus cited when calling him a magician. The NT just continues this old Jewish theme. It's not NT-specific. It goes back to the Torah. That's why the Pharisees call Jesus a sorceror in the gospels. This is what Jews always called false prophets.
The Quran takes this same background and basically says look guys, it's not that complicated. God's true prophets always come and give the *same fucking message,* which is that God will pass judgment and punish the wicked, and the righteous believers will be saved. Good people saved, bad people punished, that is the message that all true prophets bring, and everything else that religions try to claim (only Jews will be saved, Jesus was himself God) is a bunch of whackjob priestly bullshit.
Ironically, Islam then developed its own whackjob specializations.