Almighty Allah refuted the claims of the Jews and the Christians in many verses of the Glorious Qur'an.
And they say: 'The Most Beneficent (Allah) has begotten a son (or offspring or children) as the Jews say: Ezra is the son of Allah, and the Christians say that He has begotten a son (Christ), and the pagan Arabs say that He has begotten daughters (angels, etc.)."
Indeed you have brought forth (said) a terrible evil thing Where by the heavens are almost torn, and the earth is split asunder, and the mountains fall in ruins, that they ascribe a son (or offspring or children) to the Most Beneficent (Allah).
But it is not suitable for (the Majesty of) the Most Beneficent (Allah) that He should beget a son (or offspring or children). There is none in the heavens and the earth but comes unto the Most Beneficent (Allah) as a slave. Verily He knows each one of them, and has counted them a full counting And everyone of them will come to Him alone on the Day of Resurrection (without any helper, or protector or defender). Surah 19: 88-95
Allah the Exalted also declared: Yet, they join the jinns as partners in worship with Allah, though He has created them (the jinns), and they attribute falsely without knowledge sons and daughters to Him. Be He Glorified! And Exalted above (all) that they attribute to Him.
He is the Originator of the heavens and the earth. How can He have children when He has no wife? He created all things and He is the All-Knower of everything.
Such is Allah your Lord! La ilaha illa Huwa (none has the right to be worshipped but He), the Creator of all things. So worship Him (Alone), and He is the Wakil (Trustee, Disposer of affairs, Guardian etc.) over all things.
No vision can grasp Him, but His Grasp is over all vision. He is the Most Subtle and Courteous, Well-Acquainted with all things. Surah 6: 100-103
Almighty Allah commanded: 0 people of the Scripture (Jews and Christians)! Do not exceed the limits in your religion, nor say of Allah aught but the truth. The Messiah Jesus, son of Mary was (no more than) a Messenger of Allah and His Word, ("Be" - and he was) which He bestowed on Mary and a spirit (Ruh) created by Him; so believe in Allah and His Messengers. Say not: 'Three (trinity)!" Cease! (It is) better for you. For Allah is (the only) One Ilah (God), Glory be to Him (Far Exalted is He) above having a son. To Him belongs all that is in the heavens and all that is in the earth. And Allah is All-Sufficient as a Disposer of affairs.
The Messiah will never be proud to reject to be a slave to Allah, nor the angels who are near (to Allah). And whosoever rejects His worship and is proud, then He will gather them all together unto Himself So, as for those who believed (in the Oneness of Allah - Islamic Monotheism) and did deeds of righteousness, He will give their (due) rewards, and more out of His Bounty. But as for those who refuse His worship and were proud, He will punish them with a painful torment. And they will not find for themselves besides Allah any protector or helper. Surah 4: 171-173
Almighty Allah also declared: And the Jews say: Ezra is the son of Allah, and the Christians say: Messiah is the son of Allah. That is a saying from their mouths. They imitate the saying of the disbelievers of old. Allah Curse be on them, how they are deluded a way from the truth!
They (Jews and Christians) took their rabbis and their monks to be their lords besides Allah, (by obeying them in things which they made lawful or unlawful according to their own desires without being ordered by Allah) and (they also took as their lord) Messiah, son of Mary, while they (Jews and Christians) were commanded (in the Torah and the Gospel) to worship none but One Ilah (God - Allah) La ilaha illa Huwa (none has the right to be worshiped but He). Praise and glory be to Him, (far above is He) from having the partners they associate (with Him). Surah 9: 30-32
Allah the Almighty also revealed: Now ask them (0 Muhammad): 'Are there (only) daughters for your Lord and sons for them?" Or did We create the angels females while they were witnesses?
Verily it is of their falsehood that they (Quraish pagans) say: 'Allah has begotten offspring or children (e. angels are the daughters of Allah)" And, verily they are liars!
Has He (then) chosen daughters rather than sons? What is the matter with you? How do you decide? Will you not then remember? Or is there for you a plain authority? Then bring your Book if you are truthful!
And they have invented a kinship, between Him and the jinns, but the jinn know well that they have indeed to appear (before Him) (i.e. they will be brought for accounts).
Glorified be Allah! (He is free) from what they attribute unto Him! Except the slaves of Allah, whom He chooses (for His Mercy i.e. true believers of Islamic Monotheism who do not attribute false things unto Allah). Surah 37: 149-160
And Almighty Allah declared: Surely in disbelief are they who say that Allah is the Messiah, son of Mary. Say (0 Muhammad): "Who then has the least power against Allah, if He were to destroy the Messiah, son of Mary his mother, and all those who are on the earth together?" And to Allah belongs the dominion of the heavens and the earth, and all that is between them. He creates what He wills. And Allah is Able to do all things.
And (both) the Jews and the Christians say: "We are the children of Allah and His loved ones." Say: "Why then does He punish you for your sins?" Nay you are but human beings, of those He has created, He forgives whom He wills and He punishes whom He wills. And to Allah belongs the dominion of the heavens and the earth and all that is between them, and to Him is the return (of all).
O people of the Scripture (Jews and Christians)! Now has come to you Our Messenger (Muhammad) making (things) clear unto you, after a break in (the series of) Messengers, lest you say: 'There came unto us no bringer of glad tidings and no warner." But now has come unto you a bringer of glad tidings and a warner. And Allah is Able to do all things. Surah 6: 17-19
Allah the Exalted warned: Surely they have disbelieved who say: 'Allah is the Messiah (Jesus), son of Mary." But the Messiah (Jesus) said: "O Children of Israel! Worship Allah, my Lord and your Lord." Verily whosoever sets up partners in worship with Allah, then Allah has forbidden Paradise for him, and the Fire will be his abode. And for the Zalimun (polytheists and wrong-doers) there are no helpers.
Surely disbelievers are those who said: 'Allah is the third of the three (in a Trinity)." But there is no Ilah (god) (none who has the right to be worshipped) but One Ilah (God- Allah). And if they cease not from what they say verily a painful torment will befall the disbelievers among them.
Will they not repent to Allah and ask His Forgiveness? For Allah is Oft-Forgiving Most Merciful.
The Messiah (Jesus), son of Mary, was no more than a Messenger; many were the Messengers that passed a way before him. His mother (Mary) was a Siddiqah i.e. she believed in the Words of Allah and His Books. They both used to eat food (as any other human being, while Allah does not eat). Look how We make the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) clear to them, yet look how they are deluded a way (from the truth). Surah 6: 72-75
And Almighty Allah ordered: And say: 'All the praises and thanks be to Allah, Who has not begotten a son (nor an offspring), and Who has no partner in (His) Dominion, nor He is low to have a Wali (helper, protector or supporter). And magnify Him with all the magnificence, Allah u-A kbar (Allah is the Most Great). " Surah 17: 111
The pagans once asked the Prophet Muhammad : 'To whom is your Lord related, His original ancestors and His various branches of descendants?" It is also reported that the Jews said: "We worship Ezra, the Son of Allah," and the Christians said: "Jesus is the Son of Allah," and the Magians said: "We worship the sun and the moon," and the Pagans said: "We worship idols."
In response to all of them Allah revealed some of His attributes: Unity, Uniqueness, and other substantives:
Say (0 Muhammad): "He is Allah, (the) One. Allah AsSamad (The Self-Sufficient Master, Whom all creatures need, He neither eats nor drinks). He begets not, nor was He begotten; and there is none co-equal or comparable unto Him. " Surah 112: 1-4