It is called faith for a reason. I am not a religious person, but I have never seen anyone provide proof that God doesn't exist. And unless he physically turns up or we do actually meet him in the afterlife, then there never will be proof of his existence. But asking for proof is to completely miss the point of faith.
There are obviously some that do, but I think most religious people don't take the bible literally. Scientific discoveries do nothing to disprove God, because believing in God requires faith, not evidence.
Saying that, if you accept the bible has some poetic license and not to be taken literally, then the big bang, formation of galaxies and evolution is not too far removed from the book of Genesis. Perhaps the Bible is the original scientific textbook?