Religion is created by man. In the past people created gods or deities to explain what they could not. The Greeks couldn't explain storms or volcanoes or how the seasons changed so they attributed these occurrences as abilities to gods. In other words they created gods to fill their void in knowledge. As time moves forward man as a whole learned more and more, so slowly polytheism was no longer needed as there was less of a void to fill. Thus monotheism spread to replace polytheism. Now we come to the present. People are afraid of a void in knowledge, so they create or join a religion because they need something to believe in to stop their fear from consuming them. Since humans first live we have died, death is one of humanities greatest fears as it is unknown what happens. This is why almost every religion has some sort of explanation such as, Elisium, Valhalla, and Heaven. More and more people are leaving religion, due to a high understanding, and as for death, more and more people simply except it as part of life. Thus, religion is no longer needed to fill the void.