I believe in god because I can be happier knowing that when I die, I'll go to heaven. If I don't believe, then I'll just die in the dirt. That's a very bad feeling. I don't like bad feelings. Therefore, I believe in god so that I can have a more positive state of mind.

That's the usual definition and that's disputed. Hence the " ". I did never claim time and space where the same concept.

Oh I love it when that argument comes up. Slap a whole new definition to a worth used since ancient times.

Still says nothing about whether god is an omnipotent _being_ that creates the laws of the universe. If god is existence itself then its merely a formal word for describing the universe as is and could be argued has really nothing to do with the general concept of god as being discussed in this thread.

If you believe just for the sake of believing, then I don't think you will die happy. If you understand what you believe in then you will probably die happy. It's in humans nature to ask him/herself about his/her origins and about the end.

How does science believe? Are you sure there are only four dimensions?  Is not dimension something we measure and not to define what space really is? Is not time just a measurement?

No one can prove anything either ways, because that's beyond our rationale. But I do respect that you have an open mind and believe that there's a possibility of a superior being existing and sharing its existence. Either ways, the fact that this universe exists, but it hasn't existed once, means it's not a necessary being, therefore there was something existing before the universe. I choose to call that God, it's just a name we have for it.

And that's how religion comes into play if I understand correctly. =P

Space is purely a mathematical definition. In Maths, there can be n-dimensional spaces, with n being the number of dimensions. What we know for real is that what we can perceive are 3 dimensions and that we are going forwards in time. We are confined to 3 spatial dimensions in this universe though.

A man can understand its own origins without the help of religion though. Philosophy is based purely on reasoning, while religion is based on faith.

Oh yes the possibility is there, cannot even be refuted. It's just actually believing in an actual one of those possibilities over another, begs me to refute it. ;) 

"Either ways, the fact that this universe exists, but it hasn't existed once, means it's not a necessary being, therefore there was something existing before the universe. I choose to call that God, it's just a name we have for it."

I'm not exactly sure what you mean by this, but we cannot prove that the universe hasn't always existed, that the big bang theory isn't merely an incomplete view of a larger possibility called the cyclical universe theory (universe experiences a series of crunches and bangs forever). We do not know whether even needs to be something existing before the universe.