Because by not devoting the time to the study of the bible, they can devote the time to CURRICULAR activities.
How are these students in the wrong? I am sure there would have been no problem if they met to discuss literature or the history of religions. But because they meet to pray, to sing and to discuss the Bible, their meeting is being looked at with suspicion. How is that? Where's the freedom of expression? Has the school become the police of thought?