Historical revisionism involves either the illegitimate distortion of the historical record or a careful and more objective re-examination of the historical data about a historical event or events.
Those who engage in denialism often pose as historical revisionists in order to cloak their motivations. A term for engaging in denialism when reporting false histories is the term historical negationism. For example, Holocaust deniers engage in historical negationism.
Howard Zinn is often charged with being guilty of historical revisionism (with his book A People's History of the United States being the most infamous example).
Atheism and illegitimate historical revisionism
Atheists commonly engage in historical revisionism in order to illegitimately distort the historical record (see: Atheism and historical revisionism).