Man this topic is so widely debated and has been for so long only because we can't possibly know. It's still fun to talk about tho. well... I don't believe in nothing, because of a few cool proofs (not proof, mind you, but proofs, as in set up in the mathematical way) that were originally thought up by St. Augustine in his Suma Theologica.

Uncaused Cause:

-Because of the Law of Cause and Effect, every effect has a cause.
-We can follow this cause/effect chain as far back as we want.
-Why can't this chain go back forever?
-If that were true, there would have been an infinite amount of time before the point in time where we are right now.
-This is not possible because if it were true, we could never have arrived at this point, because of the nature of time.
-So there must be SOMETHING that doesn't have a cause, something supernatural, able to work outside the realm of scientific law.


Conservation of Matter/Energy
(this one is kinda flimsy with new advances in science and particle theory, but its still my favorite)

-According to the laws of conservation of matter and energy, matter and energy cannot be created or destroyed
-There is matter and energy all around us.
-Therefore, this matter/energy must have either been introduced by something able to work outside of this law, or it was always here.
-It cannot have always been here, because of the same infinity reasons as before.
-So it must have been placed here by something.


Complexity

I don't remember this one too well, but the gist is that everything is super complex and shows signs of intelligence, as opposed to random assembly. Even with natural selection and evolution (which I WHOLEHEARTEDLY believe in) it is mindboggling to imagine going from primal energy and genetic material to bacteria... and then from there the mutations to take that bacteria to animals and other lifeforms... well those mutations would be so damn random and incredibly extreme.

Anyway... I consider myself Catholic... so i believe in all the big stuff, but im pretty hypocritical if you ask me... I'm not a very good christian, but I dont really give a damn. in fact one of the main reasons I am is because it seems to be the best option of all the religions out there... and im not atheist or agnostic because of this:

Belief

When faced with this very question (does something happen when we die) this is a logical way to look at your options and their outcomes. It really simplifies the whole thing, but its still got a point

You have four things that could happen when you die.

1. There is nothing out there and you think there is something
Outcome: Well, it doesn't really matter... there's nothing, so you won't really care

2. There is nothing out there and you think there is nothing
Outcome: Also... doesn't matter for the same reasons

3. There is something out there and you think there is nothing
Outcome: Well youre kinda screwed according to religion (as long as you knew the religion option was there, but in this day and age... well you do)

4. There is something and you believe there is something
Outcome: YAY eternal happiness...

It's not foolproof... I mean look at how you can live your life if you aren't focused on religion...

Well, thats about the extent of stuff off the top of my head (blame catholic school)

I can't be too religious tho, i smoke, and thats a sin apparently hehe