Is Christianity the friend or foe of democracy? Were the founding fathers of the United States Christians or deists? What are the facts?
The Greeks and Romans experimented with various forms of government, but when the Roman Empire fell, Europe reverted to monarchy. They also followed this approach in church government, which led to putting the authority of men before the word of God. During the Renaissance there was dabbling in Greek and Roman types of government. But this was confined to a few places. One reason for this is that democracy had not yet become a cause to fight or die for.
Then came the Protestant Reformation. One of the principles of the Reformation was that we have the right and responsibility to interpret Scripture for ourselves (Matthew 15:7-9; Acts 17:11; Galatians 1:8,9). This caused the Reformed branch of Protestantism to put the government of the church in the hands of the people. They also advocated popular civil government. These do not necessarily follow from each other. (Freedom of interpretation is taught in Scripture, but it is questionable whether Scripture prescribes any form of church government, and it says nothing about the form of civil government.) But they do fit together. If we can interpret Scripture for ourselves, then should we not be able to have a say in running the church? And if we can be trusted to run the church, can we not also be trusted to run the state? And the truth of God was something people were willing to fight and die for. This took the democratic political system from an oddity practiced in Switzerland and a few Italian cities to a broadly held principle.
But as Europe became more secular, a number of people (including deists, deism being watered-down Christianity) threw out the Reformed theological beliefs and kept the political convictions. John Locke was a key deist who advocated political liberty, but he got the idea from Protestants such as Thomas Hooker and Samuel Rutherford.
Many people of Reformed theology ended up coming to the New World to worship God as they saw fit. Other colonists were influenced by their beliefs or at least their political convictions. Therefore, on the question of whether the Founding Fathers were Christians or deists the answer is yes, some of both were included. But they were following principles that originated from their Protestant heritage.
What difference does this make? The democratic system that originated from Christianity had within it a strong sense of responsibility and a concept of the rule of law. To see what democracy becomes without these, we need look no further than the French Revolution, which followed a completely secular approach. I do not believe the United States, in spite of its rejection of Christianity, has yet totally cast off its tradition of rule of law. But if it does, all that will be left will be anarchy and a tyranny of the majority.