One of the gravest accusations against Christians that is found in the Qur'an is the charge that Christians have deified Jesus, who was merely a messenger of Allah.
The author of the Qur'an did apparently not understand that the Bible and Christian doctrine speaks of exactly the opposite, the incarnation of God, i.e. God who became man, not the elevation of a human to the level of deity.
See the sections Who is Jesus? and The Trinity.
The deification of Muhammad
Most Muslim and non-Muslim readers will be surprised or even shocked to see to what extent Muslim piety has elevated Muhammad to super-human levels. In fact, the articles in this section show that the deification of Muhammad is based on the Qur'an itself: