If you are going to accept the idea that the devil exists then you also have to accept the idea that god exists.

First of all, no where is it promised that if you listen to god your life will be wonderful and happy. You're supposed to listen to god because you want to. Not because you are going to be rewarded. All your rewards are supposed to come after your death. Hense the whole basis on faith in the first place.

So, on one hand you have god telling you to listen to him and do what he says. Now most of what he says will, at the least, keep you healthy. Though you may lose a good deal of fun. Now if you do all these things, when you die, you will go to heaven, which is supposed to be a nice joyous place where everyone is happy. (Keep in mind I'm going from the traditional point of view).

On the other hand, you have the devil, who says do what ever the hell you want. Of course, most of the stuff we want to do can lead to death and sickness if done in excess. And there are no instances of the devil making every thing all better if you really mess up. Then you die, and you go to a firey pit of hell where the afterlife sucks and you spend eternity in pain and misery. (Still traditional here)

Oh yeah, I wanna follow the guy that doesn't give a damn about me, and just wants company while he's roasting.

Sure whatever they tell you in church is someone's translation, but please use a little bit of logic here.

God's basic rules are: Be good. Take care of your body. Be nice to people. Respect other's. Basically things that lead to a good healthy society.

Devil's basic rules: Do want you want. Don't help anyone unless you get something out of it. Try to screw as many people over on your way to the top. Me first, me first, me first.

Hmm..I can see how the other side of the story is so much better.

(Note: Above was in the traditional sense, since that's where it started in the first place.)