What belief system is defined as a belief in gods or a god?

Theism is defined as the belief in one or more deities, which can include gods or a god. This belief system encompasses various religions and spiritual practices that affirm the existence of divine beings who may be involved in the creation, maintenance, and governance of the universe. Theistic belief systems generally imply that a relationship exists between humans and these divine beings, which can manifest through prayer, worship, and other religious activities.

In contrast, non-theism refers to belief systems that do not focus on the concept of gods or deities, and atheism outright rejects belief in any gods or divine being. Spiritualism often includes the belief in a spiritual essence or afterlife without necessarily involving a god or divine figures. Hence, theism is the category that directly correlates with a belief in gods or a god, making it the correct response.