Quran 5:82 ::: You find Jews and pagans among the worst of the enemies of the believers. (Of the non-believers)
nearest to them (the believers) in affection you find those who say, "We are Christians," for among them are the priests and monks who are not proud.
Yes, it is wrong to say that Christ is the son of God or that they believe in three things instead of the one God. They themselves know that this belief has been imposed on them from a historical point of view. In any case, you should not address them like that. Christians believe in the same God and prophets that we have. However, because their books have been distorted and they were persecuted by the church for years, they have lost their religion or they have no real knowledge about the original and undistorted religion.
I don't know which country you are from, but in my country Islam republic of Iran, during the holy defense 1980, Christians fought alongside Muslims. Also, my leader has visited the families of their martyrs from time to time yet.
However, I somewhat agree with you about
Mohammed_123 . Because he abandoned the concepts of the Quran and stuck to its mathematics.