It's just too hard for me to wrap my head around the fact that the universe just popped into existence. Why? From what? Can we ever really know? I kind of don't think so. How can we even look past the Big Bang? There's a limit in time we can't see, not even as fuzzy static. What lies behind that... my guess is ultimately as good as anyone else's.
I remember that before anyone told me about the Big Bang theory, I had assumed that the universe had always existed. Things don't just pop into existence, and yet here we are, so everything must have always been right? For a kid who didn't know about astronomy, it was a natural assumption to make. I remember thinking that the Big Bang theory was really weird when it was first explained to me, and I still do in a way, even though I trust that astrophysicists probably understand this sort of thing better than I do.
Even today, I like the Big Crunch idea because it intuitively makes sense. Also, as a new BSG fan, I like the 'All of This Has Happened Before, and All of This Will Happen Again' theme.