I agree with #6, what schools have done is assured your right to choose. Some students choose to pray, and some to not pray. Furthermore, having a common prayer structure - whether it is the prayer itself, or merely the physical setting - which is required is a limitation of rights. For instance, some religions do not allow members of both sexes to pray together; requiring students to do so is unacceptable.
Schools can, and should, provide an opportunity for personal reflection, and each student should be allowed the freedom of his or her own thoughts at that time.