This coming Spring, Thomas Nelson Publishers will release a new book by David Barton: The Jefferson Lies. This book exposes many of the modern lies about Jefferson that have been concocted, promoted, and perpetuated by the Secular and Academic Left.
The need for this book was recently made evident by an atheist group’s California billboard allegedly quoting Jefferson condemning Christianity. (See article for more information.)
This quote used on the billboard first surfaced in 1906, when anti-religionist John E. Remsburg authored Six Historic Americans, attempting to show that six notable national leaders were anti-Christian Freethinkers (i.e., atheists, of whom he claimed that Jefferson was one).  According to Remsburg, Jefferson had declared:
I have recently been examining all the known superstitions of the world and do not find in our particular superstition [Christianity] one redeeming feature. They are all alike, founded upon fables and mythology. 
The only problem with this quote is that it doesn’t exist. It has never been found in any Jefferson writing;  yet it remains one of the many lies about Jefferson told by the Secular and Academic Left over the past century. (Remsburg also attributed other bogus quotes to Jefferson, but even though they are easily disproved, they are still used today.)
Strikingly, Jefferson’s position on religion is actually the opposite of what is often claimed today. To see the authoritative documentation of this fact, look for The Jefferson Lies (to be released in the Spring), and discover from Jefferson’s own writings not only the truth about this particular lie but also many other Jefferson myths and lies that we were steadily fed throughout the twentieth century.
John E. Remsburg, Six Historic Americans
(New York: The Truth Seeker, 1906), p. 74 (at: http://www.infidels.org/library/historical/john_remsburg/six_historic_americans/chapter_2.html
) (accessed on May 27, 2011). See also
Achayar S [the nom de plume
of D. M. Murdock], Suns of God, Krishna, Budda and Christ Unveiled
(Kempton, IL: Unlimited Adventures Press, 2004), p. 372; Bridger Daquan, American Serfdom vs. Eternal Vigilance is the Price of Liberty
(Victoria, Canada: Trafford Publishing, 2009), p.101; E Christopher Reyes, In His Name
(Bloomington, IN: Author House, 2010), p. 233.