In 1920, Lewis moved to
New York where he made contact with The Freethinkers Society, an organization founded in 1915. As founder of the Truth Publishing Company, he was prosecuted in 1927 by John Saxton Sumner, secretary of the New York Society for the Suppression of Vice, "for publishing and selling
William J. Robinson's
Sexual Truths....At a hearing [in 1921], one of the counsels stated that a federal indictment was being prepared against Truth, because it was suspected of sending not only information regarding contraception to certain customers but also prophylactics themselves."" In 1928 Lewis incorporated The Freethinkers Society and renamed it "The Freethinkers of America" and became its president (a title he would keep for the rest of his life). He later started his own publishing company, the Freethought Press Association, through which he published literature about freethought written by himself and others. Lewis' book
The Bible Unmasked was published in 1926 and 15000 copies of it were sold. A bulletin,
The Freethinkers of America, was started by Lewis in 1928. In the 1940s it was renamed
Freethinker and in the 1950s to its final name
Age of Reason (named after Thomas Paine's book
The Age of Reason). Contributors to the bulletin were, among others, William J. Fielding,
Corliss Lamont and Franklin Steiner. Over the years, Lewis brought a series of lawsuits, generally unsuccessful, to challenge what he saw as violations of the
separation of church and state. He publicized these suits in the pages of the Freethinkers of America's successive bulletins. He also challenged notable faith healers. Some of his other initiatives proved successful. He raised funds to erect statues of Thomas Paine in
Morristown, New Jersey; Paine's birthplace at Thetford, England; and Paris, France. He placed a bust of Paine in
New York University's Hall of Fame, though he was unable to place a bust of Ingersoll there. His agitation was at least partly responsible for the issuing (in 1968) of a U.S. postage stamp honoring Paine. (He walked out of its unveiling ceremony in Philadelphia after a prayer was said.) In 1954, he orchestrated the second restoration of the
birthplace of nineteenth-century agnostic orator Robert Green Ingersoll; a freethought museum operated at the Dresden, New York, site for several years thereafter. Lewis believed that Thomas Paine was the true author of the
Declaration of Independence, and made his case for this theory in his 1947 book
Thomas Paine, Author of the Declaration of Independence. His other noteworthy publications included
The Ten Commandments (1946), a lengthy justification for atheism, and
An Atheist Manifesto (1954), published at the height of the
Cold War to dispute popular ideas that atheism was un-American. He deeply recognized the meaning of Paine's ideas for establishing of the US and acquiring its independence from Great Britain. His first attempt to create a committee in order to include Paine's name in the Hall of Fame of New York was made in 1935 but was interrupted by the World War II. He appreciated Paine a lot for his ideas of "common man" and the freedom of slaves in the US, and Lewis believed that Paine had inspired Jefferson politically. the organization foundered. "It had become too much an extension of Lewis himself," wrote Robert Morrell. her rise to prominence was occasioned by her unexpected victory in a U. S. Supreme Court church-state case, one much like the lawsuits Lewis had repeatedly brought to far more modest success. Lewis played an important role as a bridging figure between the
Golden Age of Freethought and the reappearance of atheism on the public stage in the 1960s. ==Personal life==