If that were a two-way street, nothing would be wrong with that.
But, one atheist is trying to prevent hundreds of Christian children from praying before a high school football game.
One other atheist is trying to prevent millions of Christian children from any mention of God.
This, while true, is not the rosey example you paint with your question.
If atheists are guaranteed a right to freely be atheists, the Christians are guaranteed the right to freely be Christian. It's just that Christians are the only religious group being persecuted with our current twisting of The Law.
;-/
But, one atheist is trying to prevent hundreds of Christian children from praying before a high school football game.Apparently, you are referring to Santa Fe ISD v. Doe, where the Court ruled 6-3 that a public school event with a secular purpose (in this case a football game) could not include prayer in the formal agenda. The plaintiffs in this case were Roman Catholic and Mormon families tired of the pervasive Baptist prosletyzing in their public schools.
Please note that this decision, heavily referenced in the Ninth Circuit's ruling in the Pledge case, was decided by the same Court that will review their decision.
-Eric