Final answer:
The concept that only one religion is true is referred to as religious exclusivism, a view often advocated by monotheistic faiths like Christianity, Islam, and Judaism.
Step-by-step explanation:
The belief that only one religion is completely true is known as religious exclusivism. Religions such as Christianity, Islam, and Judaism, often advocate this view to varying degrees. While they acknowledge that other religions may contain elements of truth, they assert that their faith provides a unique and comprehensive path to the divine or ultimate truth.
Religious systems vary widely, including theistic and non-theistic traditions, and encompass differing views on the divine, ethical codes, and paths to spiritual fulfillment. Understanding the nature of these systems can involve examining their historical origins, textual foundations, and the influence of cultural contexts.