What are some of the theories as to why there is religion in societies and how would they explain?

This is my theory. Religion in this day and age is a product of the human mind no doubt. There is sufficient scientific evidence that disproves and debunks even the most popular religions such as christianity. The reason theists so strongly believe in their gods or godesses' is from a weakness or ignorance towards true understanding. It also provides the weak with a figure that effects them psychologicaly and provides them with enough artificial mental stimulation to cary on through difficult times. IE when the going gets tough one simply prays to their god and suddenly they "know" that the powers at be will take care of them, giving them the attitude to move forward. I believe religion trully is a tool, or model, for modern societies to "direct" traffic and maintain a certain level of ignorance, while providing the elite with a convenient excuse to righteously persue any agenda. While this may seem far fetched their are plenty of examples wich if taken in the right context, with an open mind seem plausible.