So what was The Age of Reason? The work was an attack on orthodox Christianity. These notes were contributed by members of the GradeSaver community. 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. Guide Review - 'The Age of Reason' Summary. Written by Van Nguyen and other people who wish to remain anonymous. The Age of Reason was a series of influential pamphlets written by Thomas Paine throughout the 1790s and into the early 1800s. He is known for following and promoting Deism. We are thankful for their contributions and encourage you to make your own. The Age of Reason Summary. Paine is straightforward—this essay is … Thomas Paine was a political activist in both England and America, active in the eighteenth and nineteenth centuries. Deists believed that the … 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 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.