Let’s look at the ayah, 5:116:
And (remember) when Allah will say (on the Day of Resurrection): "O 'Iesa (Jesus), son of Maryam (Mary)! Did you say unto men: ‘Worship me and my mother as two gods besides Allah?’ " He will say: "Glory be to You! It was not for me to say what I had no right (to say). Had I said such a thing, You would surely have known it. You know what is in my inner-self though I do not know what is in Yours, truly, You, only You, are the All-Knower of all that is hidden and unseen.
This ayah doesn’t talk about the Trinity, so just read it as it is, without reading Trinity into it. The Trinity is mentioned in other places, but not here, which is why I said that two concepts are conflated. Those two concepts are (1) the Trinity, and (2) worshiping Mary.
So the mistake some people make is thinking that worship of Mary is part of the Trinity, which of course is incorrect. Note how nowhere in the Qur’an is it ever even implied that Mary is part of the Trinity.
What is implied, however, is that Mary is worshiped. I think Christians might argue with that, but that is how Islam views Mary’s place in the religion, especially in Catholicism (moreso than Protestantism), that she is worshiped, in that she is prayed to. Muslims consider that to be worship.
The Trinity is referred to in other places, though.
If you find something in the Qur’an that you disagree with, regarding your own worship, then just say as much, i.e., that you disagree with it. But try and figure out what it means if you want, and why it doesn’t actually say that Christians worship three gods. And contemplate on why it doesn’t say that. I think it’s interesting.
- There are standards for accepting hadith, and qualified scholars will examine them and grade them, and once they are accepted as being sound, pretty much everyone accepts them. But Shi’a have a different standard.