i have to take Gyrene's side on this one........
the big bang theory and the theory of evolution are just that: theories.
is that to say all of science is based off of theories? because it is. what if everything we know about the universe is wrong, because the scientists screwed up their theories?
Theory in everyday speech and theory in science are two different words.
Theory in everyday speech is a guess, a hypothesis.
Theory in science is an explaination of observations and laws, which puts it all in the big picture for us.
And what if your particular explaination is wrong? We could all be wrong, and some other thing could have happened to make the universe. Richard Dawkins makes a good joke on this as well; "Well what if it's the Juju at the Bottom of the Sea?"
You see, you make an argument from fear of being wrong, but your position is much more shaky (unless of course you take the position of "I don't know and I don't care", in which case you can't be right or wrong, logically).
-Penguin