What is the ruling of Islamic law regarding a Muslim student reciting Surahs from the Quran, such as Al-Fatiha, An-Nas, or Al-Falaq, in a Christian boarding school, followed by all present, including the Christians, saying "Amen"?

Opposition to Jews and Christians and hostility towards them for the sake of Allah is a fundamental principle of the religion. Allah has forbidden us from befriending them or sitting with them if they disbelieve in His verses or mock them. Missionary schools seek to mislead Muslim children and corrupt their beliefs by teaching them that Christianity and Islam are the same, thereby demolishing the doctrine of al-wala' wal-bara' (loyalty and disavowal), casting doubt on the Quran and Sunnah (definition), removing barriers between Muslims and Christians, extinguishing the spirit of jihad, and portraying Sunnis as terrorists. Therefore, one must be wary of these schools and not allow enrollment in them. The image mentioned in the question is objectionable because it implies that Islam and Christianity do not differ, which is the principle of interfaith rapprochement that the West seeks to instill in Muslims to turn them away from their religion.