It has now been established that Sam Brownback, R-Kan is a member of the Family or C Street. It is a religious cult that many member of the US congress belong to...I very much enjoy the moonbat's lack of respect for the integrity of words.
As the Republican Party implodes the public is becoming aware of a secretive Christian society known as the Family or the Fellowship. The group was founded in 1935 in opposition to FDR's New Deal and its adherents subscribe to a far right Christian fundamentalist and free market ideology.
For example, a cult (latin:cultus) is generally a group which is separated from the main by a particular devotion, practice, or doctrine. For example, among Catholics you might have the cult of Saint Oswald or of Saint Dagobert - and these tiny groups would be offset from the whole body by their particular devotion. Within protestantism, cults are similarly divided from the whole. Mormons are considered a cult while the New England Evangelical Baptist Fellowship, composed of but 10 churches and 600 people, is not. What makes the difference? Cults operate outside the "acceptable" limits of Protestant doctrine.
Secondly, fundamentalist is not a synonym for "bad." Fundamentalism in Christian theology was a turn-of-the-20th century Protestant reaction to liberal theology or the Social Gospel, which attempted to dress Progressive do-goodism in religious garb. Fundamentalism promoted the historical "fundamentals" of Protestantism (e.g. inerrancy of scripture, bodily resurrection, vicarious atonement). In short, fundamentalism represents the doctrinal 'core' of Protestantism.
It is very difficult to posit that one could have a fundamentalist cult, or a cult that follows 'fundamentalist ideology' - they are a contradiction in terms. Making a practicing Roman Catholic a member of such a Protestant oxymoron just compounds the confusion. Whatever "The Family" is, besides a small ministry that provides fellowship for politicians and operates the annual National Prayer Breakfast, it's probably not one of those.