What christian principles do christians mean when they say

What christian principles do christians mean when they say that the US Constitution was founded on?  I have asked this of many christians that have claimed these principles are what it is based on. I have never gotten an answer to this question from the people who make these types of comments on the blogs I read. I have found a few sites that discuss these claims and will be doing a few post over the next few months reviewing them. Anyone interested in helping me with this check out this site. I figure I will make this the main one I will be reviewing. http://www.faithfacts.org/christ-and-the-culture/the-bible-and-government