People are cluttering Facebook and Twitter with calls to put God, and specifically prayer, in the public schools. I'm old enough to remember compulsory prayer in school: It was Christian, and Protestant at that.
If some way around 1962's Engel v. Vitale Supreme Court decision were found, I think the Constitution would still not allow one form of religious belief to be privileged. So how would you devout folks feel about Muslim, Jewish, Hindu, Buddhist, or Native American prayers in the schools? Wiccan? Perhaps not so enthusiastic?
The Founders knew what life was like in nations with official state religions, and they were determined that the United States would be a secular republic, with freedom to profess any form of religion, or none. True, the early Republic was culturally Christian, and mainly Protestant, but if you look out the window, you may notice that white Protestants have become a minority, and we usually frown on a minority that seeks to dictate to the majority.
So if are concerned to spread Christian belief and practice, you might do well to emulate the earliest Christians, by the example of your lives rather than by attempts to hijack the state to impose your preferences.