Humankind has into him, the ability to believe. Intrinsically, naturally whether be it, an idea, a thing (trees, animals, the sun, the moon or any creatures..). 

He can also believes in a Higher Being, like God if he wants to make a meaning of his own existence and his surroundings. He's also able to believe in godless existence, that the life on earth is caused by chance and chaos through billions years evolution. He's also doubtful, sceptical. He's still not sure if there's a God. And, there's the 4th kind of human. He knows God exists but he doesn't want to believe.

As he's able to believe he believes in anything. 

His journey of exploration and findings is full of symbols throughout his own existence. Symbols he made into his head they have a meaning, an explanation behind anything he's unable himself to explain.

He sees symbols in everything, everywhere. As he's already surrounded by signs in his daily life, it makes him, unconsciously, an easy believer.

Throughout ages, mankind has always believed in something. Ancient civilizations believed in their plants as they had cure to such illness and such till the point where generations to generations they believed these plants, flowers and tree as they were deities. 

Deities of cure and life versus deities of sufferings and death. Deities of love and peace versus deities of hate and war.. They put in everything surrounded them a belief..

To be continued..