Some of the settlers came here to escape religious persecution, this is true. But, this isn't what our country was built on. Period. I am in NO way wanting a theocracy, by ANY means, but let's not twist history to back up our personal opinions. Our country was founded by Christian men who wished to be independent of England. Mainly due to taxes and abuse. Religion played a VERY small part, if any, as to why they wanted to separate from England. Anyways, that's beside the point of my comment.
I agree that making a "show" of our faith in public is most times exactly that, a show. It is done by many who wish to be exalted and considered more righteous, pious, et cetera. However, I've been taught from the Bible that a man is supposed to share the love of God with as many people as he can, whenever he can. I believe Jesus said something about that.
Would it do me or my God any good to shout down people walking on the street, warning them of their sin? It really isn't my style, BUT, here in America, we have the freedom of Speech. We also have the freedom of Religion.
See, this is where the fictional "separation of church and state" nonsense comes into effect. We DO have the Freedom of Speech and the Freedom of Religion, but you must never mix the two on public property. Otherwise, secular humanists will complain that their tax money is being wasted.
I can think of a few government funded programs that Christians might find offensive.