Northrup Frye in Words with Power (1990) wrote (on page 97) that most religions accept a specific mythological background and translate it into a doctrine that is to be believed.
Mythology of American Religion, stemming from the Bible:
We are the chosen people, called to impart democracy to the world, as Constantine did Christianity. Our saviour and protector is Bush.
Our highest virtue: 'patriotism', which means uncritical obedience to higher military and civil authority.
Our understanding of Christianity: minimal, although many Americans are sincere Christians.
We are, in the words of Frye (100), "sectarians who confine ourselves to two or thee proof-texts".
Our future: likely comparable to that of other chosen people through the ages.