What were the characters is of roman catholicism and eastern orthodoxy

 The beginning of the Church was with Jesus and the Apostles. To succeed the work they had began, some people were chosen, the bishops and later 5 Patriarchades, but, with time, some differences came up and the Orthodod Church had their Fathers of the Church. The Catholic Church hasthe Pope as its supreme leader.

the best description of postwar writers might be progressive.

following the war, writers showed a tendency to work on artistic or social matters rather than political themes. while postwar literature may not have been the greatest period of english literature, the themes provided excellent critics a high number of novels. such examples include anthony burgess, anthony powell and frank kermode, all of which can be placed under the progressive view.