At my school, which is a Church of England academy, instead of assemblies, we do "Collective Worship" (although everyone still calls them assemblies). With whole-school assemblies, each class takes turns to pick a few students to read Christian prayers to the whole school. However, in my class, nobody has volunteered, so our teacher is threatening to pick names out of a hat. We (myself and a few other friends who agreed) argue that we cannot be forced to preach the existence of God when we are atheist, as that could violate freedom of speech or a law on religion. Our main points are that we would begin with "Dear Lord," implying that we believe in a God, then end with "Amen," which translates to "I agree/believe," which we don't.
Is forcing an atheist student to read a Christian prayer illegal or prohibited in any way?
Would Article 14 of the UNCRC apply?