Some other quotes from God from jefferson have also been posted on FR. as well.
Your saying they did not say these things is not really an expert witness on the subject.
So they will stand as is.
Or just made them up. No reference to these quotes I've ever seen even states a specific writing or date and place.
Your Washington quote "It is impossible to rightly govern the world without God and the Bible" is always attributed to be from his farewell address of 1796, but if you'd like to read it for yourself, you'll find that the quote is not in there. It is a Christian fabrication.