Why - if we were purely physical creatures - would we have evolved a need for something/someone that doesn't even exist?
If we were created then evolution is a design. Evolution is a long process spanning over billions of years. If evolution is a design then that long process is designed. What would be the reasons for the designed long and painful process? All we have to do is examine the development of any single human being (including ourselves) and we have the answer.
-Sab