Well,
It seems to me that you are 'doing good' because you are fearful of the
afterlife consequences of not doing good, rather than doing good for it's own purpose.
That sort of taints the whole purpose of doing good. You are beliving in a god for selfish purposes.. and doing good for selfish purposes.
Demons were mentioned earlier. Man does not need demons to do bad. HOweve, demons are a good excuse to blame something other then himself for the harm he does others.
Get rid of the beleif in demons, and you have to accept the responsiblity for your own actions.
Get rid of the concept of heaven and reward, you can do good for it's own sake, rather than responding to the carrot and stick story.