Founding Fathers knowing God?

This topic has been a hot topic over the last few years with media and the unbelieving public that is increasing everyday. The point of view of those who want to re-write history by telling half truths of on the founding fathers and what they really believed in. You would have to go there journal writings to get the meaning and TRUE purpose of the Declaration of Independence and the Constitution. There is one site that I have found that has this information. That site is http://www.wallbuilders.com/ and look for yourself and find all the information you need to answer this question.

Did the Founding Fathers know God and knew once God is out of the everyday decision making of this country that we will suffer for it?