Ashwin..we agree that guidlines are internal..religion is just a reinforcement to internal traits we have.

beeseh,
religion is a guide given to humans by God through prophets. If you examine religions, you will see all of them support good values and condemns injustices and killing the innocent. No religion is required to let us agree on those values.. So religion indeed is compatible with our instincts. it is just a formualted tool sent to us by God to organise our lives. Religion also help in every aspect of life where visibility is not clear too.