Final answer:
The category of religion that focuses on a belief in a single, supreme being or god is Theism.
Step-by-step explanation:
The category of religion that focuses on a belief in a single, supreme being or god is Theism. Theism is the belief in a personal God who is the creator and ruler of the universe. This belief is found in religions such as Christianity, Islam, and Judaism. These religions worship and follow the teachings of a single, supreme deity.
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