Being late has its advantages - The Qur'an

One of the perks for being a young religion is that you get to demonize/denounce other religions and put it right in your holy book. Ain't that nice?

Christianity had its turn with the ancient gods of the region which it pejoratively generalized as the "pagan" gods. So being sister religion, Islam had a go too against her big sister.

This post is mainly for referencing purposes. So here are the relevant excerpts from the holy book of Islam, the Qur'an (Koran).

Qur'an 4:88-93 (Yusufali translation)
They say: "(Allah) Most Gracious has begotten a son!" Indeed ye have put forth a thing most monstrous! At it the skies are ready to burst, the earth to split asunder, and the mountains to fall down in utter ruin, that they should invoke a son for (Allah) Most Gracious. For it is not consonant with the majesty of (Allah) Most Gracious that He should beget a son. Not one of the beings in the heavens and the earth but must come to (Allah) Most Gracious as a servant.

Qur'an 4:171 (Yusufali translation)
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, and His Word, which He bestowed on Mary, and a spirit proceeding from Him: so believe in Allah and His messengers. Say not "Trinity" : desist: it will be better for you: for Allah is one Allah: Glory be to Him: (far exalted is He) above having a son. To Him belong all things in the heavens and on earth. And enough is Allah as a Disposer of affairs.

Qur'an 5:72-78 (Yusufali translation)
They do blaspheme who say: "Allah is Christ the son of Mary." But said Christ: "O Children of Israel! worship Allah, my Lord and your Lord." Whoever joins other gods with Allah,- Allah will forbid him the garden, and the Fire will be his abode. There will for the wrong-doers be no one to help. They do blaspheme who say: Allah is one of three in a Trinity: for there is no god except One Allah. If they desist not from their word (of blasphemy), verily a grievous penalty will befall the blasphemers among them.

Why turn they not to Allah, and seek His forgiveness? For Allah is Oft-forgiving, Most Merciful.

Christ the son of Mary was no more than a messenger; many were the messengers that passed away before him. His mother was a woman of truth. They had both to eat their (daily) food. See how Allah doth make His signs clear to them; yet see in what ways they are deluded away from the truth!

Say: "Will ye worship, besides Allah, something which hath no power either to harm or benefit you? But Allah,- He it is that heareth and knoweth all things." Say: "O people of the Book! exceed not in your religion the bounds (of what is proper), trespassing beyond the truth, nor follow the vain desires of people who went wrong in times gone by,- who misled many, and strayed (themselves) from the even way.
Curses were pronounced on those among the Children of Israel who rejected Faith, by the tongue of David and of Jesus the son of Mary: because they disobeyed and persisted in excesses.