This looks like a good book. On the surface, it seems fair and balanced. I have as yet only read the amazon preview.
I don't know if I'd go so far to say that it is "un-American" but there is a lot of evidence to suggest that the notion of American being a "Christian Nation" runs counter to the Founding Fathers intentions.
The term "separation of church and state" derives from a letter written to the Danbury Baptists of Connecticut explaining to them that they should have no fear that the gov't would institute a national religion.
Likewise, Thomas Jefferson also wrote a treatise concerning the Barbary Wars sent to Muslims that detailed the United States as specifically not a Christian nation.
My take is that colonial Americans certainly mostly were religious, specifically Christian as it was a custom past down from its European past, but that the government itself sought to remain completely neutral. Therefore the invocation of the US being a "Christian Nation" is prefaced on a distortion of the facts.
But I wouldn't go so far to call it un-American.
Edited by Hyroglyphx, : No reason given.
"Reason obeys itself; and ignorance submits to whatever is dictated to it" -- Thomas Paine