Of the rest of the population, there was 1 member of an Orthodox church, and there were 9 individuals (or about 0.41% of the population) who belonged to another Christian church. There was 1 individual who was Jewish, and 18 (or about 0.82% of the population) who were Islamic. There were 2 individuals who were Buddhist and 4 individuals who belonged to another church. 64 (or about 2.91% of the population) belonged to no church, are agnostic or atheist, and 93 individuals (or about 4.23% of the population) did not answer the question. The International Seminary of Saint Pius X, the premier seminary of the Society of Saint Pius X, is located in Écône in Riddle. It is one of the six houses for formation for the future priests of The Society of Saint Pius X. The Seminary of Écône was founded in 1970 by Archbishop Marcel Lefebvre, and his tomb can be found there. In Riddes about 676 or (30.8%) of the population have completed non-mandatory upper secondary education, and 143 or (6.5%) have completed additional higher education (either university or a "Fachhochschule"). Of the 143 who completed tertiary schooling, 60.1% were Swiss men, 21.0% were Swiss women, 15.4% were non-Swiss men and 3.5% were non-Swiss women.  , there were 75 students in Riddes who came from another municipality, while 113 residents attended schools outside the municipality. Riddes is home to the "Bibliothèque communale et scolaire" library. The library has () 6,867 books or other media, and loaned out 8,328 items in the same year. It was open a total of 160 days with average of 8 hours per week during that year.