When it comes right down to brass tacks, there's only one question that really matters. Its the whole "Is there a God" thing. Whether you refer to a supreme being as God, Allah, Vishnu, Thor, doesn't really matter much for purposes of this discussion. People for the most part can be broken down into one of two camps: theists and atheists (agnostics, face it, you're really theists with a fear of committment).
Many people have argued both sides, usually quite passionately. I must admit, I'm surprised at the passion that can be aroused in atheists. Its hard to believe people can get so worked up about what they do not believe in. And I am sure that no matter what side you are on, nothing I will ever say will shift sides. However, I would like to weigh in on the issue with a carefully mangled metaphor.
Imagine you're in a casino. There are only two tables. On the right is a game called "Theism". To play, all you have to do is put your marker on the table to indicate your belief in a divine being. If you win, you get an Eternity of splendour and happiness. If you lose, you get nothing. All you lose is your marker.
To the left is a game called "Atheism". To play, all you have to do is put your marker on the table to indicate your belief that there is no divine being. If you win, you get nothing, and you lose your marker. If you lose, you burn in agony for all of Eternity. Or maybe get your marker back and a chance to play again (however, if this does happen, your memories of playing the game will be erased).
Which is why I chose to believe. Frankly, the odds - as infinitesimal as they may be - are in my favour.