fundamentalism. First applied as a term in the 1920's to conservative Protestant Christians in the United States wishing for a return to what they saw as the "fundamentals" of Protestant Christianity, (see Fundamentalist Christianity) the term popularly and within the academic discipline of comparative religion refers to movements primarily in Islam, Judiaism and Christianity that exists as "a kind of...rebellion against the secular hegemony of the modern world." ("Fundamentalism in the Modern World," Sojornors, March-April 2002, remark by Karen Armstrong.)
In more specific terms, the religious right is identified primarily with conservative and almost always evangelical Protestants and, to a slightly lesser but growing extent, conservative and traditionalist Roman Catholics; The Christian right is eccletic and crosses denominational lines; the groups and movements within it often being conflated or mistaken as synonymous, such as conservative evangelicals (or evangelicals in general) and fundementalists. The Christian right includes conservative Protestant evangelicals, fundamentalists (the vast majority of whom are evangelicals, too), but also Pentacostals, conservative Charismatics, and Dominionists, who include groups diverging from one another along relatively specific points of theology (or policy), but who are all theocrats, or "theonomists"--that is, advocates of a Christian (as they interpret Christian) theocracy--the most well-known of whom are Christian Reconstructionists. The Christian right increasingly includes conservative Roman Catholics, a result of they and the Protestants finding enough common cause enough in specific cultural battles and opinions about social issues (e.g. battles against abortion, civil rights for gay Americans, government funding for the arts, etc.) that they can overcome or overlook longstanding theological and cultural differences that in earlier generations bred distrust and even hostility.
(including college campus groups, single-issue advocacy organizations, and more), institutions (including evangelical Christian colleges, think tanks, and more), media (including publishing companies and the nation's approximately ##,### Christian radio stations), associated leaders and elected officials
The above definition's omissions are key.