In response to: Where's the proof?

I've been looking at all the posts and people are very hopeful and I suppose the title of this debate could inspire hope the with words in the context of "believe", however for debating purposes I'll ask the obvious question: Where's the proof?

Many of you think that aliens exist without any creditable evidence at all, that's is really quite amazing! Well if we can all make bullshit claims like that then, shit, the flying spaghetti monster must be real. Yes I get it, space is big perhaps infinitely big so our logic tends to shift to...other organisms existing?

Here's my take: Evolution takes billions of years, and I am sure "aliens" will sprout one day but they will not come to fruition in our life time, our era of existence. The other thing is, I am sure organisms lived before us as well but because space is so vast, we will never come to learn about their existence. Could I be wrong about that statement...sure, but it's what I believe.

Do aliens exist outside the earth? Not in our lifetime, I am sure mathematical probabilities will back me up. Prove me wrong, I dare you, show me the evidence.