"The Founding Fathers envisioned a robustly Christian yet religiously tolerant America, with churches serving as vital institutions that would eclipse the state in importance. Throughout our nation’s history, churches have done what no government can ever do, namely teach morality and civility. Moral and civil individuals are largely governed by their own sense of right and wrong, and hence have little need for external government. This is the real reason the collectivist Left hates religion: Churches as institutions compete with the state for the people’s allegiance, and many devout people put their faith in God before their faith in the state. Knowing this, the secularists wage an ongoing war against religion, chipping away bit by bit at our nation’s Christian heritage. Christmas itself may soon be a casualty of that war."

- Dr. Paul

http://www.lewrockwell.com/paul/paul148.html

Above quote is just for an example.