"Allah is the God of the Jews and Christians."
OK, so now I understand the source of your confusion. The Koran specifically denies the deity of Christ, or that He is God incarnate.
Here Muhammad calls Christians liars and calls for "Allah" to destroy them for worshipping Christ!
[9.30] And the Jews say: Uzair is the son of Allah; and the Christians say: The Messiah is the son of Allah; these are the words of their mouths; they imitate the saying of those who disbelieved before; may Allah destroy them; how they are turned away!
Here Muhammad writes that Christ wasn't even crucified!
[4.157] And their saying: Surely we have killed the Messiah, Isa son of Marium, the apostle of Allah; and they did not kill him nor did they crucify him, but it appeared to them so (like Isa) and most surely those who differ therein are only in a doubt about it; they have no knowledge respecting it, but only follow a conjecture, and they killed him not for sure.
Here Muhammad tells Christians not to lie about the Christ, and calls Christ but just one of Allah's prophets, and even claims that Allah had no son nor needed one!
[4.171] O followers of the Book! do not exceed the limits in your religion, and do not speak (lies) against Allah, but (speak) the truth; the Messiah, Isa son of Marium is only an apostle of Allah and His Word which He communicated to Marium and a spirit from Him; believe therefore in Allah and His apostles, and say not, Three. Desist, it is better for you; Allah is only one God; far be It from His glory that He should have a son, whatever is in the heavens and whatever is in the earth is His, and Allah is sufficient for a Protector.
Here Muhammad repeats his claim that Christ "is but an apostle" of Allah, then chastises Christians, claiming they have turned away by worshipping Christ!
[5.75] The Messiah, son of Marium is but an apostle; apostles before him have indeed passed away; and his mother was a truthful woman; they both used to eat food. See how We make the communications clear to them, then behold, how they are turned away.
Now, what does the Apostle John tell us of such "spirits?"
I John 4:1-3
"Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world. This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God, but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world."
I John 4:14-15
"And we have seen and testify that the Father has sent his Son to be the Savior of the world. If anyone acknowledges that Jesus is the Son of God, God lives in him and he in God."
II John 7,
"Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist."
Now you may not agree with any of this, but then that's the difference between Christianity and Islam: you are free to believe anything you wish in a Christian culture. You are not free to do so in a Muslim one.
Now, run along and get this thread pulled because you don't like the truth.