Religion is excellent stuff for keeping common people quiet. -- Napoleon Bonaparte

It's a simple matter of power.

number three If you want to be one up on somebody, be the one who makes the rules. Even little kids understand that. You've seen them lie to other kids for no reason other than to control them.

We know that people in power want to hold on to that power and increase it. What could be better than convincing people that you have access to even greater knowledge and power than they can see in you? - knowledge and power that can be available to them only through you.