The Quran is completely wrong (as usual) about the trinity

TL; DR
Despite making a lot of claims about Christians being misguided Al Lah doesnt know even the most basic aspect of what Christians believe. He thinks that the trinity is the Father, Son, and Mother.

Sources as always!

Verily, those who disbelieve from among the people of the scripture and Al-Mushrikun will abide in the fire of hell. They are the worst of creatures. Sura 98 verse 6

And behold! Allah will say: "O Jesus the son of Mary! Didst thou say unto men, worship me and my mother as gods in derogation of Allah'?" He will say: "Glory to Thee! never could I say what I had no right (to say). Had I said such a thing, thou wouldst indeed have known it. Thou knowest what is in my heart, Thou I know not what is in Thine. For Thou knowest in full all that is hidden
Quran 5:116

They surely disbelieve who say: Lo! Allah is the Messiah, son of Mary. The Messiah (himself) said: O Children of Israel, worship Allah, my Lord and your Lord. Lo! whoso ascribeth partners unto Allah, for him Allah hath forbidden paradise. His abode is the Fire. For evil-doers there will be no helpers. They surely disbelieve who say: Lo! Allah is the third of three; when there is no Allah save the One Allah. If they desist not from so saying a painful doom will fall on those of them who disbelieve. Will they not rather turn unto Allah and seek forgiveness of Him? For Allah is Forgiving, Merciful. The Messiah, son of Mary, was no other than a messenger, messengers (the like of whom) had passed away before him. And his mother was a saintly woman. And they both used to eat (earthly) food. See how We make the revelations clear for them, and see how they are turned away!
Quran 5:72-75

Remember a great resource to learn more is:
wikiislam.net
https://www.answering-islam.org/