Pl search the web for "Animal Worship" to understand how the system of wroship originated. Various forms of worships we see today is the continuation of the system of wroship of the primitive tribes thousands of years back.
Despite the tremendous growth in science and technology, a good majority of people want to believe in some "supreme creator" and such notions.
Another important point is that almost every religion teaches its followers how to better a life here-after, none of them are teaching how to live life on planet earth!
Also search the web for "Actual Freedom - the third alternative" This is an alternative to organized religions. It will definitely enrich your knowledge about the basic traits of humanbeings.