I think it's safe to say that a lot of the Founding Fathers followed Deism. It is something that a lot of them believe in. In fact, it is one of the reasons a lot of them wanted to escape the oppressive nature of the crown. Some of them wanted the freedom of religious rights and freedoms.
The idea that science, observations of the natural world, and general existence are all proof of a creator is deism. Many of the founders were members of an organization known as the Freemasons. The Freemasons required then, and still require an acceptance of deism for membership. If the founding fathers were not true believers in deism, then they did a lot of lying to cover that disbelief up.
Jefferson, Madison, Franklin, Paine, and (arguably) Washington were all deists. This country was not founded on Christian Values, partially as a result.
It is generally agreed that they all believed in a god, but not specifically the Christian god. This is surprising for the time, as 250 years ago, belief in a certain God of a religion was almost universal.
Many of the Founding Fathers including Ben Franklin, Thomas Jefferson, James Madison, Thomas Paine and Alexander Hamilton were all influenced by the work of French philosopher Voltaire who believed Newtonian science can also explain how God's laws work. Deism embraces both science and religion, which is where reason came into being during the process of writing the Constitution of the United States of America. Many of our Founding Fathers weren't Christians--they were Deists! Surprised?
A majority of the founding fathers followed deism. This is because of the fact that a majority of the founding fathers were Christians. Christianity is a form of deism. Deism is simply the belief of a god. A major part of Christianity is that the tenants believe in a god.
The religions and beliefs of the Founding Fathers can easily be found on the Internet. The majority of the Founding Fathers fell under Protestant churches, while a few followed Deistic ideals. Thomas Paine is the only one that can be directly linked to Deism, although Thomas Jefferson and Ben Franklin were both anti-clerical.