Allah Declares He Has No Son
In many verses of the Glorious Qur'an Allah the Exalted denied the claim of the Christians that He has a son.
A delegation from Nagran came to the Prophet Muhammad . They began to talk about their claim about the Trinity, which is that Allah is three in one, the Father, Son, and Holy Spirit, with some disagreement among their sects. That is why Allah affirmed in many verses of the Qur'an that Jesus is a slave of Allah, whom He molded in the womb of his mother like any other of His creatures, and that He created him without a father, as He created Adam without a father or mother.
The Birth of Mary - Qur'anic
Allah the Almighty said: Allah chose Adam, Noah, the family of Abraham and the family of Imran above the Alamin (mankind and jinns) (of their times). Offspring, one of the other, and Allah is the All-Hearer, All-Knower.
(Remember) when the wife of Imran said: "0 my Lord! I have vowed to You what (the child that) is in my womb to be dedicated for Your services (free from all worldly work; to serve Your Place of worship), so accept this, from me. Verily, You are the All-Hearer, the All-Knowing."
Then when she delivered her (child Mary), she said: "0 my Lord! I have delivered a female child," - and Allah knew better what she delivered, - "and the male is not like the female, and I have named her Mary, and I seek refuge with You (Allah) for her and for her offspring from Satan, the outcast." Surah 3: 33-36
Mary's Sustenance - Qur'anic
So her Lord (Allah) accepted her with goodly acceptance. He made her grow in a good manner and put her under the care of Zechariah. Every time he entered Al-Mihrab (a praying place or a private room), he found her supplied with sustenance.
He said: "0 Mary! From where have you got this?"
She said: "From Allah. Verily, Allah provides sustenance to whom He wills, without limit." Surah 3: 37