The subject of this research is comprehension of the concept of secularism by theologians of the Abrahamic religious tradition (Christianity, Islam, and Judaism) in the late XX – early XXI centuries. The object of this research is secularism as the phenomenon of modernity. Leaning on the methodology of contextualism, comparative and content analysis, in terms of civilizational approach, the author studies the interpretation of the concept of secularism within the framework of confessional theological discourse. The author has examined the corresponding representations of theologians of the Orthodox, Catholic and Protestant Christian traditions, including the inter-Christian movement of radical Orthodoxy. Analysis is also conducted on the concept of secularism in modern classical Islam and moderate Orthodox Judaism. The main conclusions are as follows: the theologians of all indicated denominations trace the origins of secularism in the West; Islamic theologians agree upon the fact that radical Orthodoxy takes roots in Christianity itself; the representatives of Catholic tradition see secularism as the ideology similar to fundamentalism, however, they deny its universality, and thereby supporting the Orthodox interpretation of secularism. A number of Orthodox theologians view secularism not just as the ideology aimed at achieving the complete elimination religions from public life to purely private life, but also as quasi-religion, which is extraneous to the principles of secularism. Islamic theology believes that secularism, which is alien to the Muslim world, is a serious but not critical challenge brought from the West. Islamic theology tends to see secularism only as ideology, which at times is irrational. Jewish moderate Orthodoxy views secularism as the challenge to traditional meanings that are fundamental to human community. In this regard, they advocate for the so-called ideological consensus between religious belief and secular modernity.