You have to admit, the big bang theory is really pretty esoteric.
There was nothing and then BOOM! the Universe. See how I explained the Big Bang theory. Yes the details are esoteric but the details are only important to cosmologists.
There is also the on-going problem with the big bang theory in some peoples minds that there is no consensus at to where the matter and energy that composed it originally came from.
But these same people have no problem with where God came from.
I can see how people are bothered by the fact that we don't live in a causal universe but that's the way it is.