Doesn't "The U.S. wasn't founded on Christian doctrine" sound like a conspiracy theory...?

Oh, I get it! This is a Christian nation and others who are not Christians (Jews, Muslims, Hindus, Buddhists, Pagans, Wiccans, Atheists) are allowed to live here but only at your pleasure. You magnanimously allow us to practice our religion but if we were to do anything you believed to be "anti-Christian nation", then you could oppress us and make us toe the line...Do I have this right?