Just to be clear, the big bang is not a 'fact' and it has nothing to do with evolutionary theory but...
Evidence for big bang: cosmic background radiation, red shifting, elemental distribution just to name a few
Evidence for Creationism: None (what would evidence of creationism even look like)
I believe the theory with the strongest evidence but I know it can change as the evidence changes.
Exactly, "I don't know" is a much more logical answer than "God did it" which is the answer many people in this thread are proposing. My personal goal is for people to be honest with themselves and admit when they don't know. I wish people didn't feel the need to have all the answers to all the questions of life.