Do not trust anything you hear David Barton say. His goal is to twist history to suit his agenda and the agenda of his backers. His most recent work, The Jefferson Lies, has been dropped by its publisher as a result of the string of factual errors found in it. In fact, the book was so off base that another book had to be written just to respond to all of the inaccuracies (Getting Jefferson Write by Warren Throckmorton). He is not a historian, he is a conservative activist and his claims are consistently debunked. Please see the myriad of examples below. Believe me, there are hundreds more if you are interested.
Even More Conservative Scholars Publicly Question David Barton's Scholarship | Right Wing Watch
My Response and Three Challenges to David Barton - Dr. Warren Throckmorton Christian Blog
A Math and Reading Comprehension Lesson for David Barton | Right Wing Watch
Barton: People Who Say the Constitution is Secular are Just 'Biblically Illiterate' | Right Wing Watch