Were the Founding Fathers "Unchurched"

There is ample evidence a majority of the early colonists did not belong to the early churches. Whether they were "religious" or not we don't know. Some wrote letters which remain today inferring they were religious. Could it be they wanted to give that impression to that particular reader, often a relative? The best answer is we don't really know. The worst answer is "Our founding fathers intended this to be a Christain nation." 

Like all of us, the all male crew called the "Founders" came from a variety of backgrounds and had different experiences that influenced them. From what I've read, their primary preoccupation was not religion but business. George Washington wanted to sell the products from the expansive farm he married into and was annoyed at tariffs between the colonies. There were very wealthy businessmen who loaned money to the government because it allowed them to prosper. 

Where did "a Christian nation" fit into all these business deals? In recent years I've read several books about the main characters, George Washington, Alexander Hamilton, John Adams, Thomas Jefferson, Benjamin Franklin, etc. These books were not necessarily the last word in historical authenticity but provided an overview written for easy reading and book sales. They were all based on public records and private correspondences of which huge amounts survived to this day. Absent in all cases was discussion of a "Christian nation." All knew the King or Queen of England was head of the Church of England. No one liked this. They seemed determined to be different from England in this way. It might even be accurate to say the very thing they did not want the U. S. to be is a "Christian Nation." 

 With the increase in the percentage of secular voters we may slowly be moving away from the old saw Founding Fathers were Christians and wanted the country to be Christian. Most of them were casual if at all Christian.