Big Bang: the Universe was originally squashed into tiny space,which then exploded...and the expansion is still going on Steady State: basically,this said that the universe always existed(and would always exist)pretty much as it is now-there was no huge explosion God: well basically god created the universe Well...I believe in the big bang theory because the universe is expanding(according to the scientist) so something must have got them going in the first place. That 'something' was probably a big explosion-the big bang so which one would you believe and why?