The conscience of the tribal was determined by the their taboos. To overcome the remorse one feels, the penitents may gather or come individually tot their chief and tell in sequence the wrongs they have done. If the crime is too personal, they go to a sacred place and express their crime before the god or goddess.
There are tribes which advocate killing to show one’s masculinity. IN some tribes, a groom had to bring the head of a man to claim a bride One can easily find that killing is
OK for the kings and for the mighty. Even today might is right in many ways.
But most of the religions advocate ‘not to kill’
As years passed, standardized and generally accepted ways of living, rituals and religious ceremonies were all established. Each community had its own norms. There is a marked difference in the moral teachings of various societies. Thus, what is good in the west can be a sin in the east and vice versa. Some have elaborate ethical principles while others have simple ones.
Religions vary in everything from the nature of god, to his commandments. Some are atheistic while others are pantheistic Some advocate monotheism but others do not speak of a separate god.
The conduct approved by one religion is disapproved by another.
Commandments of the respective gods are totally different too. Polygamy is the norm in Islam and monogamy in Christianity. In the past, a widow had to jump into the funeral pyre of her husband in Hinduism. But no other religions stipulates this. Harming other beings, however insignificant it may be is forbidden by Buddhism and Jainism. Christianity maintains that everything is created by God for man and he has to kill the animals and eat them.
The conscience of one is formed according to the moral codes and the prevailing laws of his religions and culture. Morality varies from community to community, from religion to religion. The difference between good and bad is not the same for all the people. And naturally the voice of conscience is different too.