God does not exist wake up world!?

Why are we humans so stupid and act like sheep? The bible and similar were all made by man to control man, sounds like dictatorship to me. Are we all so stupid not to see the big picture - we are just a part of nature and when we die that is it. People say what about the white light and other experiences people see when they have near death experiences. Wake up the brain is a powerful tool and we only use a very small percentage of its full capabilities that we do not fully understand. Could the white light etc be what happens when the brain is deprived of oxygen etc? Science has proven we are what nature not god intends us to be, doctors are able to remove, alter parts of our brains that change the way we think and behave thus changing our personalities and souls. What about the mentally disabled, they can do some terrible things to others and themselves only because they do not know better. But if souls exist shouldn't they prevail and let those misfortunate souls born with these mental handicaps (those who do some very bad acts) know what is right and wrong during there time on this earth and if not what happens to those souls when they die do they go to heaven even though they were bad and committed unmentionable acts to others and themselves whilst in their human form. The bible would state no they should go to hell, but that would not be fair they are incapable of knowing what is right and wrong due to their mental health. Life is all we have in this world and then we die and that is it, just like turning a telveision off, but some would like to think otherwise and religion preys and manipilates these people. Religion is DICTATORSHIP and nothing else. What do you think?