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Considering that teachers are employed by the state to educate children, not shove their religion down people's throats, I don't see anything wrong with that.
If you are a teacher you can organise your little prayer meeting on your own time.
And while we are talking about how religion is being so repressed, lets just take a look at taxes. Religion is tax free, it is also largely regulation free. In Alabama if you operate a daycare centre you have strict regulations you have to obey - unless you happen to be a church, then you don't even have to pay taxes.