See the video at Crooks and Liars. O'Reilly is claiming a "war on Easter," replete with a war on the Easter Bunny, evidently, from his graphic.
All he needs is an animated Jesus with a machine gun shooting from the tomb.
Colbert, when he did this bit with the animated Jesus almost broke character and lost it.
O'Reilly is toast; Colbert has him like a cat has a mouse if Colbert can continue to pre-empt O'Reilly's bombast with satirical bombast.
But his Newsweek author is silly; the Declaration of Independence was a political document justifying the disruption of political bonds with the highest political authorities of the country from which it broke. The Constitution is the highest law of the land. And at any rate, as I said below the "Christian nation" is basically a myth, unless by Christianity you mean violent Christianity.