- theology and the history of religions, religious studies (the author of textbooks as part of the series ’Religions of the modern Middle and far East’; the first volume presents the complex of the phenomenon of religion,[104] the second volume shows the comprehensive outline of Hinduism.[105] He has also published the textbook on the Catholic theology of religions[106] and has co-authored two textbooks on Catholic fundamental theology.[107] He has compared the idea of martyrdom in several religions of the world.[108] Investigated the contacts and interactions of the ancient Egyptians with the nomadic (Arab?) culture[109] and elements of the ancient Egyptian demonology in religion in pre-Islamic Arabia.)[110]