Biblical imagery was readily used in past centuries to illustrate points, because most people were Biblically literate unlike today. Jefferson did believe that the Indians might be a lost tribe of Israel which was a popular assumption. He was not a Christian, although he like nearly every politician including Franklin thought that the morals and values inherent in the Christian religion were essential to maintain in the new nation. He was not a religious man by any means, but an interesting one nonetheless.
It never ceases to amaze me that people 200 years later still buy the political rhetoric of the Federalists. Proof that political smears are effective.
Have a joyous day!