ok, sin is not alive, it is a concept. you could say that it evolves, but it doesn't do it biologically. it evolves in that it changes. our perception of what is evil changes. take homosexuality for example.
the only way i can think of to link sin/morals to biology would be our instincts. most humans will not kill another human willingly, and especially not close family members. sympathy and empathy are things that pretty much everyone experiences. why do we feel this? most likely because of evolution. communities where people instinctively protected each other instead of killing each other obviously survived better. same with people who help each other with food, shelter, or whatever.
there are only a few species of animals that do things like this, i think vampire bats are one of them. chimps probably are too.
the only way i can think of to link sin/morals to biology would be our instincts. most humans will not kill another human willingly, and especially not close family members. sympathy and empathy are things that pretty much everyone experiences. why do we feel this? most likely because of evolution. communities where people instinctively protected each other instead of killing each other obviously survived better. same with people who help each other with food, shelter, or whatever.
there are only a few species of animals that do things like this, i think vampire bats are one of them. chimps probably are too.
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