Every creature has those instinctual survival aspects, but it is only human kind which ponders the meaning of death and fears what may come after death, and changes its behavior based upon those ponderances and fears. I believe that most human-made religions are born of this fear of death and the need to explain it.
says who? There are many intelligent species on this planet........who knows what dolphins or elephants spend their hours thinking about. No human has ever found a means of fluent communication with them to discover this. I understand your statement.....but understand it is completely based on your conjecture, nothing proven or even researched.