What is the ruling on teaching Islamic doctrine and the most prominent Christian beliefs to mosque students, including those in the fourth, fifth, and sixth grades of primary school?

The Holy Qur’an expounded upon the many corrupt beliefs of the Christians, affirmed the Oneness of Allah, denied that He has a son, and stated that Isa (peace be upon him) is nothing but a messenger and a word from Allah. Islam has been keen on clarifying the truth and refuting falsehood, for knowing falsehood helps in avoiding it, just as the Companions used to ask about evil for fear of falling into it. Therefore, clarifying deviant beliefs is a religious matter, while taking into consideration the selection of an appropriate style for the level of the recipients to avoid discord.