Magsj wrote:Why not design a new personalised D for the deist cause, TPT?

For many of the reasons that Sumps points out--its historic context as well as the fact that many of the founders, including the ones that wrote the Declaration, were deists in fact if not in name. Jefferson is acknowledged universally as a deist, but I know of no place where he referred to himself as such. Even Thomas Paine, who wrote the American treatise advocating deism,
The Age of Reason, never came out and said "I am a deist" that I've been able to find. Such was (and often still is) the laid back or aloof nature of advocacy with a large audience.
Stumps, Yes a majority of the founders were indeed some form of Christian--often the smaller sects of which with their dogmas, needed protection from the larger sects and their dogmas. You probably know (or maybe not) that the phrase "separation of church and state" was used by Jefferson as the interpretation of the First Amendment, in a letter to a Danbury (Conn.) Baptist congregation who had written to him seeking protection from state legislation against them instigated by their Christian opponents in the state. Ironically, the Southern Baptist convention became the 20th Century Protestant denomination (America's largest), are now advocates of theocracy, and didn't even renounce the slavery they had advocated in the 19th Century, until the 1990's. "Freedom of religion not freedom from religion" is still their mantra.
You said, "However, even at that, it is thought as appropriate because of the interest in the Founding Fathers to separate Religion from Politics, which the movement of Deism strongly encourages with it's suggestion that God does not intervene with man's activities, and therefore Religion has no need to be involved with Politics since God has no interest in man's politics."
First we, at least I, believe God is intently interested in what we do. Deists believe that God does not intervene, yes, but that's not the main reason to separate church and state. The reason for that is the myriad contentious and contradictory "revealed" religions, sects and denominations. In order to meld church and state, you not only have to decide on which particular flavor of religion to use, but how, and how much of its dogma we should legislate into law. Is there anybody but a Muslim that thinks it would be appropriate to codify Sharia Law in to state, and eventually, federal law? Yes an extreme example. But which sect do you suggest?
Many founders wanted "God" and "Jesus" to be included in the Constitution in 1787, but were unable, due to an alliance of free thinkers in the leadership (including Madison, Washington, Jefferson, Franklin, Adams and Paine), Masons, and Christians who saw the ultimate value of separation of church and state.
This country almost succumbed to a theocratic coup during the Jackson administration, composed of an alliance of the National Bank, Vice President Calhoun and his allies, and Ezra Stiles Ely's alliance of reactionary Christian churches and tract societies. This period, equivalent to an American dark ages, is often swept under the rug of American history in our education system due to Christian revisionism about that period, as well as putting words in the mouths of founders as often as they could get away with it--words that are still quoted on the Internet to this day, always unattributed.
I see nothing silly about any of this.