The First Commandment of the Bible says you're wrong. If the country was founded on Judeo-Christian principles, it Commandments would be part of it. Fortunately, you are wrong and the Commandments are absent from our government.
The three "commandments" that one might advocate as proof of a foundation --no killing, no lying, no stealing-- have been part and parcel of human society since we came down out of the trees. We'd never come as far as we have if this wasn't so. What this is proof of is that religious morals stem from human empathy.