Final answer:
The concept the student is asking about is linked to monotheistic religions, where Islam is a prime example, based on the belief in one God, Allah, and the teachings of Muhammad. Polytheism involves belief in multiple deities, whereas a sect is a subgroup within a religion.
Step-by-step explanation:
The definition provided by the student refers to the belief that salvation can only be achieved through one true religion. This concept is often associated with monotheistic faiths, which are religions based on the belief in a single deity. A prominent example of such a monotheistic religion is Islam, which is based on the belief that there is one God, Allah and that Muhammad is Allah's prophet. The sacred text for Muslims is the Qur'an. Islam's central tenet is submission to the will of God, and its followers are guided by five pillars, which include daily prayer and the pilgrimage to Mecca. On the other hand, religions that believe in multiple deities are referred to as polytheistic. A sect is a subgroup within a religion that may have different interpretations or practices, but not necessarily a different belief in the number of deities.