The number of people who simply don't understand science and then expect nonsensical arguments to be taken seriously on this forum is depressing.
Basically, it all boils down to this: we have not discovered what happened 'before' the big bang (I put before in quotes because it's dubious as to whether time existed at all then), but that doesn't mean it didn't happen. That's not how science works. If there is overwhelming evidence that something occurred, you can't dismiss it because you don't know why it occurred.
And for those of you who are more scientifically literate but retain a deistic or theistic worldview: it is a logical fallacy (argument from ignorance) to assume that because we do not know what caused the beginning of the universe that a god did it.