The Bible is no more a valid historical document than the latest Harry Potter book. And if it IS historically accurate, then the Christian god is a truly genocidal, jealous, and petty god unworthy of worship and worthy only of the electric chair. 

The burden of proof is always on the one making the claim. The Bible is not "evidence." So to say there's a supernatural Christian god, the burden of proof is on you. A negative can't be proven "prove my god doesn't exist" just as me saying "prove my god, the Flying Spaghetti Monster didn't make the Earth and us" can't be proven. But the burden of that proof would be on me. 

Science is all about collecting hard evidence and is far more real than a poorly written book written by superstitious Bedouin men thousands of years ago about a vengeful, muderous god who kills millions more people than his supposed nemesis, the Devil.