Because real scientists have theories, solve for probability... Real scientists don't waste their time trying to disprove or prove a God in these petty arguments. Any evidence for or against that is professional, and highly praised isn't one sided and for your use for your childish, primitive, arguments either.
True science does not deal with bias so how can you prove or disprove a God? There is no definitive, measurable answer.
True science doesn't try to disprove a God, nor is it used as a argument for anything. Even gravity is a theory because when you get deep enough into the mechanics of the universe it is but just a theory to entertain our minds...There's extremely complexity beyond anything we've ever tried to define, quantify, measure. Lot's of it isn't even multidimensional structured in thought...
This isn't a black and white issue, it's transparent and you can't just see it one way or the other.