Yes, it is true that many Christian morals are also evolutionarily beneficial, which is a reason that they are compatible with society, but I think there are holes in the atheist origin of morality. An example would be dying for an individual that is incapable of reproducing—a childless spouse or a senior citizen.
For instance, why shouldn't you spread lies about a classmate? She still gets to survive and reproduce. Say you know that there is no possibility of you ever needing her help in the near future.
For instance, why shouldn't you spread lies about a classmate? She still gets to survive and reproduce. Say you know that there is no possibility of you ever needing her help in the near future.