Which religious concept involves the worship of multiple deities each with individual personalities?

The concept that involves the worship of multiple deities, each with their distinct personalities and traits, is polytheism. This belief system is characterized by the recognition of numerous gods and goddesses, each often governing different aspects of life, nature, and human experience. For example, in ancient religions like those of Greece and Rome, deities such as Zeus or Jupiter were revered alongside a pantheon of others, each with specific characteristics, domains, and stories.

In contrast, monotheism is the belief in a single, all-powerful deity, while animism refers to the belief that objects, places, and creatures all possess a spiritual essence. Agnosticism is a philosophical stance regarding the knowledge of the existence or non-existence of deities, emphasizing uncertainty rather than a belief in multiple gods. Thus, polytheism distinctly aligns with the idea of worshiping multiple deities, making it the correct choice.