Hmm, I think you caught on. How do we make everyone be good little boys and girls? Let's threaten them with a place like Hell, and convince them to be good by offering them a place like heaven.
I believe the answer to your question is morals. What I believe is right determines what I do. Can you not say the same?
Do you follow every guideline laid down by your religion of choice? If you do, I must admit I'm impressed, because I know not a single self proclaimed "religious person" who does not disagree/not follow certain rules because they feel they aren't correct.
Oh but that's ok, there's confession, right? The "undo" button. Makes everything better.
Thinking about the beginning of the universe, I can't accept the argument that "There was always a God, he was always there, forever, irrelevant.", I can't settle for such a simple answer.