ascesis (en)

(noun) the practice of severe self-discipline, typically for religious reasons

catechumen (en)

(noun) a convert to Christianity receiving training in doctrine and discipline before baptism / (noun) one receiving instruction in the basic doctrines of Christianity before admission to communicant membership in a church

eschatology (en)

the part of theology concerned with death, judgment, and the final destiny of the soul and of humankind

hagiography (en)

relating to the writing of the lives of saints; (derogatory) adulatory writing about another person