Thomas Paine is our intellectual hero, not only for calling America to declare independence from Britain in 1776, but also calling for a revolution of religion eighteen years later in a brilliant classic work, The Age of Reason, which is still in print and still changing the minds of believers today. I'm going to provide an excerpt from the final edition of his work. Enjoy. It's powerful, as much so as anything you'll find in David Hume, David Friedrich Strauss, Robert Ingersoll or Bertrand Russell. In it you'll find he stole something from Peter Boghossian, who defined faith as "Pretending to know things you don't know." ;-) Confound the ancients, they've stolen all of our ideas! Look for the many quotable quotes that can be found in Paine's writings.
TO MY FELLOW-CITIZENS OF THE UNITED STATES OF AMERICA: I PUT the following work under your protection. It contains my opinions upon Religion. You will do me the justice to remember, that I have always strenuously supported the Right of every Man to his own opinion, however different that opinion might be to mine. He who denies to another this right, makes a slave of himself to his present opinion, because he precludes himself the right of changing it.
The most formidable weapon against errors of every kind is Reason. I have never used any other, and I trust I never shall. --THOMAS PAINE