What is the name of the belief of primitive people?

Primitive people, after they lived for a certain period, began to come up with explanations for many processes. They were frightened by sudden rains, thunderstorms, sunrise, fire, death, wild animals and many other phenomena. Therefore, they sought to give them explanations. The most accessible to them was inventing gods and patrons of these events. The first religion of primitive people was paganism. They believed in supernatural forces and that gods and spirits rule everything in the world. This is how the first myths were born.