The paper presents the author’s point of view regarding the spiritual sphere of Russian society, changes in which were caused by the crisis resulting from the revolutionary events of February 1917, and the related experience of building a new ideology in the conditions of the transitional state law system in the Russian state in March-October 1917. The author, based on the study of a wide range of sources, critically analyzed this experience and made a number of conclusions: such construction in the conditions of permanent spiritual crisis was difficult and it was conditioned by a set of factors, namely, political, socio-economic, cultural-religious, etc. The author’s analysis of this experience was based on the study of a wide range of sources. The state of a state law anomie, that can rightly be considered one of the characteristic features of the transitional state-legal system, was the result of a deep spiritual, religious, ideological, cultural conflict that emerged, starting from the first days of the formation of the «new» Russian state, and the resulting spiritual vacuum and situation of ideological and religious uncertainty. The changing position of the Russian Orthodox Church in relation to the new bourgeois government and its reformist plans due to the political situation also contributed to the deepening of the spiritual crisis in Russian post-revolutionary society. The emphatically indifferent position of the Russian clergy towards the Provisional Government once again emphasized the unpopularity of its decisions in the eyes of society, deprived its projects of ideological support. Thus, this contributed to the loss of the government’s authority among the population. Under such conditions, all attempts of the central government to form a new post-revolutionary bourgeois-republican ideology were unsuccessful.