This volume forms a sequel to the work by the author under the title, "Outlines of a Philosophy of Religion Based Upon Psychology and History." Two systems of theology still confront one another: the theology of authority and the theology of experience. They are characterized by methods radically opposed in the scientific development of religious ideas and Christian dogmas. To the solution of the question of method the present work is consecrated. At the present hour one method is dying and destined soon to disappear; the other is taking on every more vigorous development, and is destined to triumph. Contents: Roman Catholic dogma of authority; Protestant dogma of authority; religion of the spirit.