1- Islam rejects the divine nature of Jesus Christ.

Koran-Sura 5:17 "In blasphemy indeed are those that say that Allah is Christ the son of Mary. Say: "Who then hath the least power against Allah, if His will were to destroy Christ the son of Mary"

Koran-Sura 5:72 "They do blaspheme who say: "Allah is Christ the son of Mary."

Koran-Sura 5:75 "Christ the son of Mary was no more than a messenger; many were the messengers that passed away before him."

Koran-Sura 4:171 "O People of the Book! Commit no excesses in your religion: Nor say of Allah aught but the truth. Christ Jesus the son of Mary was (no more than) a messenger of Allah...Allah is one Allah: Glory be to Him: (far exalted is He) above having a son."

Koran-Sura 112:1-3 "Say: He is Allah, the One and Only; Allah, the Eternal, Absolute; He begetteth not, nor is He begotten"

2- And when Islam's holy book teaches its followers to convert Christians to Islam and if they will not convert; to kill them.

Koran-Sura 3:19 "Surely the true religion with ALLAH is Islam. And those who were given the Book did not disagree but, after knowledge had come to them, out of mutual envy. And whoso denies the Signs of ALLAH, then surely ALLAH is quick at reckoning."

Koran-Sura 3:85 "And whoso seeks a religion other than Islam, it shall not be accepted of him, and in the Hereafter he shall be among the losers. How shall Allah guide a people who disbelieved after their belief and (after) they bore witness that the messenger is true and after clear proofs (of Allah's Sovereignty) had come unto them. And Allah guideth not wrongdoing folk. (As for) these, their reward is that upon them is the curse of Allah and the angels and of men, all together. They will abide therein. Their doom will not be lightened, neither will they be reprieved; Lo! those who disbelieve after their (profession of) belief, and afterward grow violent in disbelief: their repentance will not be accepted. And such are those who are astray."

Koran-Sura 5:51 "O you who believe! do not take the Jews and the Christians for friends; they are friends of each other; and whoever amongst you takes them for a friend, then surely he is one of them; surely Allah does not guide the unjust people."

Koran-Sura 9:30 "The Jews said, "Ezra is the son of Allah," while the Christians said, "Jesus is the son of Allah!" These are blasphemies uttered by their mouths. They thus match the blasphemies of those who have disbelieved in the past. Allah condemns them. They have surely deviated. They have set up their religious leaders and scholars as lords, instead of Allah. Others deified the Messiah, son of Mary. They were all commanded to worship only one god. There is no god except He. Be He glorified, high above having any partners. They seek to extinguish the light of ALLAH with their mouths; but ALLAH refuses but to perfect HIS light, though the disbelievers may resent it. He it is Who sent His Apostle with guidance and the religion of truth, that He might cause it to prevail over all religions, though the polytheists may resent it."

Koran-Sura 10:68 "They said, "Allah has begotten a son!" Be He glorified. He is the Most Rich. To Him belongs everything in the heavens and everything on earth. You have no proof to support such a blasphemy. Are you saying about Allah what you do not know? Say: Those who forge a lie against Allah shall not be successful.A little enjoyment in this world!- and then, to Us will be their return, then shall We make them taste the severest penalty for their blasphemies. "

Koran-Sura 19:86 ""And we will herd the guilty to Hell, to be their eternal abode. No one will possess the power to intercede, except those who conform to the laws of the Most Gracious. They said, ""The Most Gracious has begotten a son""! Assuredly, you have indeed uttered a most hideous thing.Whereby almost the heavens are torn, and the earth is split asunder and the mountains fall in ruins, Because they claim that the Most Gracious has begotten a son. It is not befitting the Most Gracious that He should beget a son."

Koran-Sura 33:6 "Accursed, they will be seized wherever found and slain with a (fierce) slaughter. (Such has been) the course of Allah with respect to those who have gone before; and you shall not find any change in the course of Allah. Allah has condemned the disbelievers, and has prepared for them Hell. Eternally they abide therein. They will find no lord, nor a supporter. The day they are thrown into Hell, they will say, "Oh, we wish we obeyed ALLAH, and obeyed His Messenger."

Koran-Sura 48:23 "HE it is Who has sent HIS Messenger with guidance and the true Religion, That HE may cause it to prevail over all other religions. And sufficient is ALLAH as a Witness."

Koran-Sura 63:4 "They are the enemy, so beware of them. Allah confound them! How they are perverted! And when it is said unto them: Come! The messenger of Allah will ask forgiveness for you! they avert their faces and thou seest them turning away, disdainful. Whether thou ask forgiveness for them or ask not forgiveness for them; Allah will not forgive them. Lo! Allah guideth not the evil-living folk."

Koran-Sura 64:8 "Believe, therefore, in ALLAH and HIS Messenger, and in the Light which WE have sent down. And ALLAH is Well-Aware of all that you do. The day when He shall gather you together for the day of mutual gathering, will be the Day of Gathering, and whoso shall have believed in Allah and Mohammed His Prophet, and done what is right, for him will He cancel his deeds of evil; and He will bring him into the gardens beneath whose shades the rivers flow, to abide therein for evermore. This will be the great bliss! But the unbelieving those who gave the lie to our signs shall be the inmates of Hellfire, wherein they shall remain for ever. And a wretched passage thither!"