Why? Let us expand this and give you the real answer.
When Jefferson penned the words to the Declaration of Independence, Jefferson considered himself a Christian, but not a mainstream Bible thumper. And, when you get 56 men in a room, unless they belong to the same church, you end up with half a dozen denominations.
Some factions back in those days would not utter a name for God, using such phraseology as found in the Declaration of Independence as Divine Providence, Creator, Nature's God and Supreme Judge of the World. This should give some examples of how the terms were used so as to express a sentiment without arousing denominational dissension:
Kevin Craig is a Christian Anarchist campaigning for *Liberty Under God* in the race for U.S. Congress in Missouri's 7th District.
kevincraig.us
I'm not sure how that will fit the narrative of this thread, but I know where you want to go.