Do you believe that God has a son? How does God have a son while He is Creator of all things? He is Unique and nothing like unto Him. God (Allah) says:
“Say, “He is Allah , [who is] One,
Allah, the Eternal Refuge.
He neither begets nor is born,
Nor is there to Him any equivalent.”” Qur’an 114:1-4
If we say God has son, we are saying that God is not unique. As son is part of father, he resembles father. This opposes attribute of God. Exalted is He!
Moreover, son is needed for continuity of progeny and help. Human being is weak and mortal. So he needs son for help at age of weakness. But God is Ever-living, never die, He is always Powerful. Weakness and fatigue never touch Him. So why does He need to have a son?
“They say, ” Allah has taken a son.” Exalted is He! Rather, to Him belongs whatever is in the heavens and the earth. All are devoutly obedient to Him, Originator of the heavens and the earth. When He decrees a matter, He only says to it, “Be,” and it is.” Qur’an 2:116-117
“O People of the Scripture (Jews and Christians), do not commit excess in your religion or say about Allah except the truth. The Messiah, Jesus, the son of Mary, was but a messenger of Allah and His word which He directed to Mary and a soul [created at a command] from Him. So believe in Allah and His messengers. And do not say, “Three”; desist – it is better for you. Indeed, Allah is but one God. Exalted is He above having a son. To Him belongs whatever is in the heavens and whatever is on the earth. And sufficient is Allah as Disposer of affairs. Never would the Messiah disdain to be a servant of Allah , nor would the angels near [to Him]. And whoever disdains His worship and is arrogant – He will gather them to Himself all together.” Qur’an 4:171-172
For more read this article https://furtusammu.wordpress.com/2017/01/04/about-jesus/