Thomas Paine was a political activist in both England and America, active in the eighteenth and nineteenth centuries. The Age of Reason Summary. Thomas Paine is often associated with the American Revolution, because of his pamphlets; but The Age of Reason is still controversial (and has been banned) for its criticism of established religion and its challenge to the Bible. He is known for following and promoting Deism. Guide Review - 'The Age of Reason' Summary. Deists believed that the … These notes were contributed by members of the GradeSaver community. Written by Van Nguyen and other people who wish to remain anonymous. We are thankful for their contributions and encourage you to make your own. So what was The Age of Reason? Paine is straightforward—this essay is … The work was an attack on orthodox Christianity. The Age of Reason by Thomas Paine is subtitled: Being an Investigation of the True and Fabulous Theology, which though often excluded when discussing the work, provides a snapshot of Paine’s focus. The Age of Reason was a series of influential pamphlets written by Thomas Paine throughout the 1790s and into the early 1800s. The three-part work, published in 1794, 1795, and 1807, was officially called The Age of Reason; Being an Investigation of True and Fabulous Theology, but it is commonly just referred to as The Age of Reason.