The belief that matter exists but that is all there is and death extinguishes personality and individuality is called:

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Quizplus · Accepted Answer

Naturalism is the philosophical belief that everything arises from natural properties and causes, and supernatural or spiritual explanations are excluded or discounted. This worldview holds that the universe is a closed system in which everything can be explained by natural causes and laws. Naturalism often leads to the conclusion that consciousness and personality cease to exist after death, as these are seen as functions of the physical brain.

The Belief That Matter Exists but That Is All There