My answer to What is the origin of the Star of David on the Congressional Seal?
Answer by Jason Corning:
The Great Seal of the United States has a recurring numerical theme for the number 13. This should come as no surprise because at the time of America's founding as a nation there were exactly 13 colonies. It just so happens that, geometrically speaking, the Star of David can be formed using 13 points with equal spacing between each of them (or 12 if you leave out the point in the very middle). It is likely that the designer who chose this symbol saw the United States as the New Israel (which was originally composed of 12 tribes who were led out of slavery from Egypt by a man named Moses, the 13th point).
At the time, the English-speaking Christian world believed the symbol for ancient Israel was, in fact, the Star of David. So, with the American Revolution being a violent rebellion against the King of England, just as Moses and his people rebelled against the Pharaoh, the victorious colonists considered themselves the New Israelites who had escaped captivity by achieving independence from England (Egypt). In short, the designers of the Great Seal had no problem with the symbol because the six-pointed star of David was seen as a Christian symbol. It still is today with numerous American churches decorated with its image, used especially in the stained glass windows.
From an Episcopalian Cathedral in Phoenix, Arizona