The reason that I think there are religions is because people need something to believe in. They need something that they can hold dear and that will make their fears of death more of a reward. People want to know that when they die they will reap what they've done throughout their lifetime. Say if someone throughout their life was always helpful, always "good", and always made sure that they were doing the right thing, if they were Christian, Christians would believe that because of those actions they would go to heaven where their souls can be eternally saved. Other religions are basically the same way just different beliefs and "rules". People want to believe that they are in one way or another rewarded for following those beliefs and "rules".
