Not a Christian country?

So, according to President Obama we are not a Christian country but a country of citizens. It seems his knowledge on US history is vague at least. Our country was founded on Judeo-Christian principles and over 85% of our country is still Jewish or Christian. Under our Constitution we do not allow government controlled religion and thus we have many different religions living peacefully in our country and are free to practice their faith without fear unlike Muslim countries. Based on his comments made during his European trip, I guess he has a severe case of foot-in-mouth disease.