Well, I doubt that we'll ever find out if God exists or not. What we should be worried about at the moment is HOW we live our lives. Religions might've/could've/should've been created to give us a guide to being good human beings. Some people misuse religion as an excuse for terrorism or wars............
For example, the Qu'ran doesn't tell ANYONE to strap a C4 to their body and go running around a public place in the name of God. Since, the guilty people will be punished later anyways... I guess. We should be using the religious books and stuff to GUIDE our lives and not FOLLOW the books word by word. If it helps you to pray to someone as it gives you the feeling that all will be well, then go ahead. Whether this has any affect on your afterlife is questionable as we can't be sure that there is an afterlife. Who knows? It all depends on how you interpret the words of holy books and how they've changed over 2000 years, even though many say that they haven't...
Anyways, the religions are all mostly the same and try to bring out the good human qualities in everyone, however, some people take it toooooooooooooo seriously. I guess you should just live your life the way you want as long as you don't cause anyone else grief and suffering. I is not making sense, eh? Oh well...