This article problematizes the study of religious nationalism, which lacks conceptual, religious, and nationalist “seriousness.” These problems of “seriousness” obscure the nature of religious nationalism as they overstretch and do not do justice to the concepts of religious nationalism, religion, and nationalism, respectively. Seeking for the nature of and a path to religious nationalism, it is suggested that the later writings of İsmet Özel, a well-known poet and public intellectual in Turkey, make an emblematic case for a religious type of nationalism, demonstrating not only religious seriousness with his Islamist ideology but also a central orientation to the nation through his exclusive focus on Turkishness and Turkey. In so doing, this article introduces a wide range of categories to specify the ways in which religious nationalism is operationalized and to measure the patterns of religious nationalism in an attempt to overcome the problems of “seriousness.” It identifies and examines six main patterns in Özel’s thinking and shows their interactions: religio-national identity, exceptionalism, religious territoriality, civilizational othering, sectarianism, and anti-secularism.