As an American politician, Jefferson had to profess some sort of religion, but his deism and/or Unitarianism are at the far extreme of what is possible while staying within the "organized" religions.

I suppose the point is that our Founding Fathers were a pretty solid Enlightenment crowd, and that we have regressed over time. Lincoln and his Bible quoting, FDR and his dragging ministers into the Executive circle, and just worse and worse as we go forward...