Well, no harm in a bit of debate. This is the debate den after all.
*Puts on his devil's advocate suit*
As Senator Daniel Inouye once said, "I have heard so often in the past few weeks eloquent and good men plead for the chance to let the majority rule. That is, they say, the essence of democracy. I disagree, for to me it is equally clear that democracy does not necessarily result from majority rule, but rather from the forged compromise of the majority with the minority."
While his speech was about filibustering (in 1963, not 2005), it applies here as well. This isn't about a 30 second prayer before a football game (though I don't doubt there are people in this country who are against that). It is about the John Scopes monkey trial, antisemitism, xenophobia, racism, and everything related. It's about protection of the minority.
Nobody is telling anyone to cease praying, the government is simply preventing prayer of any creed being forced upon anyone (Intelligent Design in the classroom, anyone?).
As for the examples of Iraq and Israel, religion is written into the constitutions of the countries. As in, Iraq was founded as an Islamic state, while Israel was founded as a Jewish state. America was founded as an agnostic state, in that the government does not acknowledge, support, discourage, or ban any religion, and our Constitution says as much.
As for the country being founded upon Christian ideals, no. The country was founded upon democratic ideals and inalienable human rights (though both have yet to be achieved). Ideals and rights you will find both accepted and denied by Christian countries, Islamic countries, Athiest countries, Jewish countries, etc.
This is by no means a complete rebuttal of the original post, nor a complete arguement on it's own. It is simply an exercize in debate.