Why would 3 billion people believe in a concept with zero proof? Simple. Its easy, its comforting, and its what their parents, grandparents, etc believed in. It ain't easy to go against what you were exposed to for all your childhood.

The biggest reasons (don't read this as proof, as said before, there is no proof against or for god) against a god of one particular religion is that there are so many different religions. The Biggest 3, despite their insistence on being one and the same god for each of the 3, have wildly different gods. So which one is correct? Suggesting that it doesn't matter which destroys all credibility.

Here's a concept for people who claim there had to be a beginning and god must be it.

Existence must exist.

The line that goes 'you can't have something from nothing' precludes the concept that there cannot and never has been nothing.

I don't believe in a God, because i can't believe in a all powerful, all knowing perfect being that creates.

Creation is a act of challenge, to create something new, something better, something that has not been done before.

A perfect being would not create anything, it is all knowing, the moment it just thinks about creating it already knows how it would turn out and how it will end, there is no point in creating it.

a perfect being is all powerful it can create whatever it wants, but there is no challenge, because everything would work out perfectly, the being itself is perfect, why would it need to create anything new, it could never be better.

any being that creates is not a god.

That's actually a pretty good one.

Because I'm being realistic.

The only proof of God is a 2,000 year old book that is not scientific at all.

The universe did not spring from "nothing". I suggest many of you read about some more of the universe's origins than just the Big Bang.

The Oscillating Universe Theory says that the universe ends with a Big Crunch then starts again with a Big Bang. Basically this means that everything has existed forever. It didn't just spring out of nothing, it was just there.

Although this is the same reasoning as God, that everything was just there.

One of the most basic principles of the universe is that matter cannot be destroyed nor created. So the Big Bang did not create any matter, everything in existence was condensed into an infinitely dense point. Many of you are thinking that everything came from nothing, but that is simply not true.

Where did that matter come from? No one knows the answer. Many people are using this as the validation of a God. But the idea that a divine superpower (which need I remind you was also there for all existence, something which you think is impossible for the physical universe) created everything is the most implausible answer of them all.

That's actually a pretty good one.

Wow...

I'm sure you have no idea of what you are talking about now. Do you really think God is only believed to exist by Christians? The notion of God has been brought up way before the big 3 actual monotheist religions came into existance. I don't agree with any of those religions, because they mix traditions and a future history of salvation with the notion of God.

God by itself is an immaterial and atemporal being that trascends this universe. God is the explanation to all the material things. Time itself isn't infinite, it has a beginning. Matter also has a beginning, as proven by science. You said yourself, that you can't explain how that initial condensed mass came into being. The notions of time and matter are only applicable to this universe, outside the universe there's no such thing as matter or time. Therefore believeing that there cannot be anything that's eternal is not logical. If there's something outside the universe, it is eternal (atemporal) and immaterial. That very same thing is god. Do not mix the God from the religions with the notion of God.

I don't believe in a God, because i can't believe in a all powerful, all knowing perfect being that creates.

Creation is a act of challenge, to create something new, something better, something that has not been done before.

A perfect being would not create anything, it is all knowing, the moment it just thinks about creating it already knows how it would turn out and how it will end, there is no point in creating it.

a perfect being is all powerful it can create whatever it wants, but there is no challenge, because everything would work out perfectly, the being itself is perfect, why would it need to create anything new, it could never be better.

any being that creates is not a god.

The simple reason I used the Bible was because I didn't feel like looking up how old the Quran was.

Got it?

You're saying that anything that is not of this universe is God? Well OK, even though this thread is talking about the omnipotent, omniscient being that created everything.

We don't even know if there is anything outside of this universe, or even if this universe has an end. You can't assume that there is because it's not even proven. It's logical to believe that there are other physical constants outside of this universe (if there is anything outside of this universe) but why would you believe that that is God?

It is perfectly acceptable to believe in the theory of "Beings outside of the universe" thing you brought up. But this needs the assumption that the universe is finite and there is something outside of it, something that you can't prove.