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in this discussion.
Now, this does depend heavily on whether this is a private school or a public school. In public school, I believe that this should not be done, no matter what. Let the students have their own religious beliefs, without being messed with by the teachers. In a private school, it would depend on if it is a religious school or not and, if it is, then it would be silly to do so.
Parents did not send their kids to school to be force-fed religion of some kind or another. Inflicting superstition on growing minds is not the job of the school system, and it is definitely not the teacher's place to attempt this. This isn't the kind of thing that can be solved with a reprimand; only instant firing will do the trick.
This evidence is in the Constitution of the United States of America. This country was founded on religious freedom, which entitles the people to believe whatever they want. They are not to be persecuted for it. However, the classroom is not a grand place for this, because children are meant to learn basic skills, and religion is not one of them.