Originally posted by Bullypulpit
One need not be religious to be moral, and history has shown us that some of the most immoral people are those who claim to be religious.
The reason this is a tricky question, is that the country was set up by a bunch of guys who were predominantly Christian, and the statement made was to be ASSUMED to be in line with that since it WAS the overwhelming way of believing. Today, that isn't the case.
IF you want to understand WHY they thought that way as opposed to why it would apply TODAY, there are 2 different paths to go down.
In the past, since it was a Christian belief system being discussed, you would have to prove validity of Biblical text in order to prove it real and logical to show morality to be linked....otherwise it is just philosophy. This was easily done through the fact that there was only one version of Biblical text that a person could have since the catholic church taught that only they could discern the Bible and their version never got out.
People had a Bible and the idea among believers was that since they had a personal relationship with Christ through a cause and effect physical proof, combined with Biblical prophecy, it was what it claimed: the unerrant word of God.
For those who didn't profess to be Christian, most believed in a God of similar nature, but called him the God "of nature" and left themselves with the logic without the relationship. They accepted the logicality of the moral code and moved on.
Today, we have a bunch of people who belive philosophies, call them religions, miss the idea of Christianity (including the relationship), and often lump it into one big pot of "take what you like, they are all ok."
That is why apply rationale from today without proper perspective of the founders makes no sense. When the people of that time made the Constitution and all public documents, they did not want anyone to be forced under a strict belief system as they were escaping and believed that a person had a CHOICE to become a Christian, which IS as Jesus taught.
Therefore, in the Constitution and the other public documents, freedom was held intact and sacred.