The document presents an introductory lecture on religion by Prof. Jeff Clyde Corpuz, discussing various definitions and dimensions of religion, including its emotional, psychological, and social aspects. It explores key concepts such as the sacred vs. profane, the role of rituals, and the importance of personal experiences in religious beliefs. Additionally, it outlines the different types of religious expressions and the reasons for the existence of religions, covering theistic, monotheistic, polytheistic, monistic, atheistic, and agnostic views.