Friday, 25 March 2016
a Jerusalem Catholic Church in Poul Anderson's Technic History;
a Neocatholic Church in Anderson's For Love And Glory;
a Reform Catholic Church in Anderson's Starfarers;
a Reformed Catholic Church on Wunderland in Jerry Pournelle's and SM Stirling's "The Hall of the Mountain King";
an Imperial Church, recognizably Catholic, in Pournelle's CoDominium future history.
Anderson and Pournelle present the inner thoughts and points of view of characters who subscribe to their future versions of Catholicism whereas Pournelle & Stirling, at least in the passage to which I refer, merely mention that there is a Reformed Catholic church in a town among the Jotun Mountains. Nevertheless, this is enough to establish the existence of such a Church.
"The Hall of the Mountain King" is an installment of the Man-Kzin Wars sub-series of Larry Niven's Known Space future history. Thus, this single reference establishes the existence of a Reformed Catholic Church in the Known Space timeline. This denomination may never be referred to again. Alternatively, some contributor to the series could build a story around it. How was the Church "reformed"? Might a kzinti Kdaptist, believing that God made Man in His image, seek admittance to a Terrestrial religion? Etc. See here.