So you want to compare "a huge orgy" to a two-minute prayer where everybody keeps their clothes on? If Hindus or Wiccans have a short, simple, non-confrontational ceremony similar to a boilerplate graduation prayer, then I suppose I would have to bear with it in a majority-Hindu or Wiccan community. That's what I get for being an odd-ball. I already would have to bear with a lot of other stuff that offends or disgusts me in public schools, so it would not be unexpected. Such is life in a diverse society.
Just because your sacred cow is on the side of the majority in this case doesn't mean it won't be in the minority next year.
My side is in the minority much of the time. Christian students are frequently told not to bring Bibles to school, not to pray quietly to themselves before they eat, etc. It is not legal, but it happens. The ironic part is that this happens
because Christianity is mistakenly viewed as a majority or a dominant view, while those of other minority religions are treated with kid gloves and even applauded for their adherence to a less conventional point of view.
Again, it is a graduation from a secular school, not semenary, catechism, religious boarding school, etc, keep religion out of it.
Your opinion that prayer is only appropriate at a religious school is just that; your opinion. Why should prayer be out of place just because the school is not overtly religious? I said it before, and it's still true: "Why not let the students, the school, the teachers, the administrators and parents decide what is necessary or desirable in their ceremony? While it is not a religious occasion, it is normal for Christians to wish to ask God's blessings on such a proceeding and to pray for the graduates." As it inconveniences no one, there is not sufficient cause to interfere with it.
It would be technically incorrect to call athiests god haters because they cannot hate something they claim does not exist.
It would be "technically incorrect" to label all religion (or just Christianity) as superstition. It does
not fit the definition you provided. More to the point, such derision is corrosive to our discussion. I am not saying you should be PC, just that dismissiveness is counterproductive.