Personally, I don't care if there is a god. I don't believe in one, but even if he (a non-sexual he) existed I would probably act the same. The way I figure it, if god created the universe, he created it to be as he wanted it to be. Therefore, I must act within the constraints of the universe to achieve his good will. Not that hard to stay on his good side, if breaking the laws of physics is the only way to sin
.
What about other rules, rules not enforced by physical reality? Well, as far as I can tell such rules are rather arbitrary. I mean, there's almost always the "thou shalt not kill" thing, but anywhere that people want to live that is going to be a rule, whether it is religious or not. But there seems to be no way to pick a book or a set of teachings that can be shown to be more religiously "true" than any other. If you rigidly follow any of them, you will like as not find yourself in a rather unholy mess of contradictions.
And if you don't rigidly follow them, then what's the point of saying you're Chistian (or any other religion with set written rules and teachings)? People that say they are Christian, but say that the Bible must be interpreted, bother me. They often seem to think that there is some fundamental difference between them interpreting the Bible and me (a non-Christian, or ex-Christian) interpreting it. I don't see what that difference is. Both of us are making decisions about our lives based on our own interpretations of our experiences. But one of us damns the other for not labeling that interpretation as Christianity.
So my religion? Live. Live by the rules that cannot be broken, and learn that you can break all the others. If there is a god, then that's what he wants you to do, because if he wanted different he would have made the rules different.