Reply #6: That's only true if the school allows other, secular organizations to use school facilities...

[Humanist_Activist]

and it wouldn't be a violation of the free exercise clause but of possibly equal protection and the Civil Rights Act. If a public school doesn't allow any organization to use their faculties after hours, then that's fine, if they only allow, for example, the Boys and Girls club and refuse others due to a protected class(such as religion), then it would be a violation of equal protection. The reverse is also true, if a public school only allows religious organizations to use their faculties, its then runs afoul of the establishment clause.