What I mean when I said that wasn't necessarily that life came from nothingness, but that what created it is so far out of the scope of imagination that we can't study it (and I'm not referring to God). Actually, and I'm being 100% honest here, the theory posited by Men in Black actually seems like it's worth a thought or two.
Honestly, why does it even matter where we came from? Even if we hypothetically find out someday, I doubt it's going to make the lives of the human race any better. If anything, all the opposing religions will riot, there'll be mass panic, and the world will go nuts. I mean, we're only alive for 80 years or so... just live.