Al Salamu 'Alaykum.
"And they said, 'The Most Merciful has taken (unto Himself) a son. Surely you have advanced something most hideous. The Heavens could well-nigh explode thereby, the earth split asunder and the mountains collapse into ruins. That they should attribute to the Most Merciful a son. It behooves not the Most Merciful that He should take a son."
(Surah Maryam verse 88-92)
Qurtubi writes: Muhammad ibn Ka'b has said that the statement about Allah taking a son is so heinous that those who uttered it almost broke the Last Hour on human beings. And Ibn al 'Arabi said, "If not for the fact that Allah is neither affected by the disbelief of the disbeliever, nor is He elevated by the belief of the believer; neither the former decreases His Kingdom by aught, nor does the latter increase it by aught, such a blasphemy would not have been allowed to roll off tongues. But the thing is, Allah Most High takes no notice of what the misguided ones have to utter about him.
Taken from Sayyid Iqbal Zaheer's Tafseer Ishraq al Ma'ani.(shortened and adapted slightly).
Wa salamu 'alaykum.