I need to watch this documentary.

You show me the aliens. Then I'll believe.

I don't think anyone here have the definite answer really. So the only rational choice is maybe.

You show me God then i'll believe you.

When asking this question, there are two possibities:

1. The universe is infinitely big so that means there's an infinite chance that conditions for life exist and for that spark to happen.  Taking that into account, even if that chance for the spark of life to happen is small, it's still likely to happen eventually.
2. The universe is infinitely big and if we're the only life then something made us unique so that it cannot happen anywhere else.

When looking at those, #1 seems much more likely than #2.

Complete nonsense, genius or no genius. He's assigning human qualities to a clearly non-human race.

I mean, for all we know, aliens are made of uranium, breathe radon and communicate by throwing tennis balls at each other. For all we know, they eat tennis balls.

To be completely correct yes, but absolute certainty isn't required to believe in something. The probability that we are the only form of life in the universe seems remarkably  low given the size and age of the universe.

@Twesterm. Infinitely? The universe has a finite space.

Our Universe is finite, not infinite. Unimaginably large I grant you, but still finite. Sorry.

But the question at hand here is "Do Aliens Exist?" and not "Do you think Aliens Exist?".