Claiming a Country made up of over 70 percent ( still today) Christians is not a Christian Country is ignorant as hell.
No, it's semantics. We are not in one sense, that being that our government does not endorse the specific religion like many other religiously controlled governments.
And yet you have no problem identifying other Countries that are not run by religious leaders as Christians. Italy being one. Spain another. Used to be Germany and France and England as well.
Irregardless of the fact our Government recognizes no set religion, the US is a Christian Nation. The Semantics are on you and Obama.