"early men's religion grew out of fear and ignorance." justify the statement in 80-100

In the past, people had been more superstitious and mythical. They believed in the movement of the stars and how it affected their daily lives. They believed that an uncertain rain is an indication of a disaster, the passing of a cat is a bad omen. 

They had the fear of everything in them, they did not gain knowledge from religion but feared it. They did not believe that God was a guide, rather thought that God would punish them for every action of theirs. 

Their ignorance made them uneducated about the real concepts of the religion. However, with the passage of time with scientific knowledge people learned that every action had a reason and they found the real concepts of religion. 

Upanishads means each of a series of scared treatises written in sans krit .it is a sanskrit word also known as sitting at the fit of masters.